PAKET UMROH BULAN FEBRUARI MARET APRIL MEI 2018

Mata merupakan jendela Anda dalam melihat dunia. Walaupun begitu, terkadang Anda tidak pernah menyadari pentingnya funsgi mata hingga Anda mengalami gangguan kesehatan mata.

Ada banyak masalah yang mampu mempengaruhi kualitas penglihatan Anda. salah satu masalah yang paling umum adalah katarak. katarak telah terjadi ketika protein yang ada di dalam mata Anda menghalangi pandangan Anda. Bahkan katarak juga dapat menjadi salah satu penyebab umum kebutaan.

Berikut adalah penyebab teratas munculnya katarak :

Usia
Usia adalah salah satu penyebab utama munculnya katarak. Protein lensa Anda akan semakin menurun ketika usia Anda bertambah. Selain faktor tersebut, faktor lingkungan juga dapat menyebabkan katarak.

Trauma
Trauma akan mengakibatkan pembengkakan, penebalan, dan munculnya warna putih di serat lensa. Warna putih yang terbentuk pada akhirnya dapat menyebabkan katarak.

Genetika
Genetika juga merupakan salah satu faktor yang dapat menyebabkan terjadinya kataraka. Sebab kelainan kromosom mampu mempengaruhi kualitas lensa mata Anda.

Penyakit kulit
Beberapa penyakit kulit tertentu mampu untuk mempengaruhi kesehatan lensa mata Anda sepertii dermatitis atopik, ichthyosis, pemfigus, dan eksim.

Infeksi
Jenis infeksi tertentu seperti kusta, toksoplasmosis, dan cysticercosis dapat memicu timbulnya katarak. Oleh karena itu apabila Anda mengalaminya, sebaiknya segera obati penyakit tersebut sebelum infeksi penyakit ini menyebar.

Diabetes
Diabetes kerap kali dituding telah menjadi penyakit yang dapat menyebabkan katarak. Sebab enzim aldosa reduktase yang ada di dalam tubuh penderita diabetes mampu memicu timbulnya penyakit katarak.

Penggunaan obat tertentu
Ada beberapa jenis obat tertentu yang mampu mempengaruhi penglihatan mata Anda. Obat-obatan seperti kortikosteroid terbukti mampu menyebabkan timbulnya katarak.

Itulah beberapa penyebab munculnya penyakit katarak. Mengetahui penyebab munculnya penyakit ini dapat menjadi cara untuk dapat mencegah penyakit katarak sebelum bertambah parah.

saco-indonesia.com, Petir adalah peristiwa alam yang sering terjadi di bumi, terjadinya seringkali mengikuti peristiwa hujan baik air atau es, peristiwa ini telah dimulai dengan munculnya awan hitam dan lidah api listrik bercahaya terang yang bergerak merambat terus memanjang kearah bumi bagaikan sulur akar dan kemudian diikuti oleh suara menggelegar dan efeknya juga akan sangat fatal bila mengenai mahluk hidup.
PROSES TERJADINYA PETIR

Terdapat 2 teori yang mendasari proses terjadinya petir :

    Proses Ionisasi
    Proses Gesekan antar awan

a. Proses Ionisasi
Petir telah terjadi diakibatkan oleh terkumpulnya ion bebas bermuatan negatif dan positif di awan, ion listrik dihasilkan oleh gesekan antar awan dan kejadian Ionisasi ini telah disebabkan oleh perubahan bentuk air mulai dari cair menjadi gas atau sebaliknya, bahkan perubahan padat (es) telah menjadi cair dan pada tahap pembekuan ini mencapai suhu dibawah 0 derajat yaitu antara -10 sampai -14 derajad celcius
Ion bebas telah menempati permukaan awan dan bergerak mengikuti angin berhembus, bila awan-awan telah terkumpul di suatu tempat maka awan bermuatan akan memiliki beda potensial cukup besar untuk dapat menyambar permukaan bumi maka inilah yang disebut petir.

b. Gesekan antar awan
Pada awalnya awan akan bergerak mengikuti arah angin, selama proses bergeraknya awan ini maka akan saling bergesekan satu dengan yang lainnya , dari proses ini terlahir electron-electron bebas bermutan negatif yang telah memenuhi permukaan awan. proses ini bisa digambarkan secara sederhana pada sebuah penggaris plastik yang digosokkan pada rambut maka penggaris ini akan mampu menarik potongan kertas.
Pada suatu saat awan ini akan terkumpul di sebuah kawasan, saat inilah petir dimungkinkan telah terjadi karena electron-elektron bebas ini telah saling menguatkan satu dengan lainnya. Sehingga telah memiliki cukup beda potensial untuk dapat menyambar permukaan bumi. kedua teori ini mungkin juga masuk akal meski kejadian sebenarnya masih merupakan sebuah misteri.
PERLINDUNGAN TERHADAP BAHAYA PETIR

Manusia selalu mencoba untuk dapat menjinakkan keganasan alam,atau setidaknya menghidarinya, salah satunya adalah Sambaran Petir. dan metode yang pernah dikembangkan:
1. Penangkal Petir Kovensional / Faraday / Frangklin
Kedua ilmuan diatas Faraday dan Frangklin telah mengetengahkan system yang hampir sama , yakni system penyalur arus listrik dengan menghubungkan antara bagian atas bangunan dan grounding. Sedangkan system perlindungan yang telah dihasilkan ujung penerima / Splitzer adalah sama pada rentang 30 ~ 45 ‘ . Perbedaannya adalah system yang telah dikembangkan oleh Faraday bahwa Kabel penghantar terletak pada sisi luar bangunan dengan pertimbangan bahwa kabel penghantar juga berfungsi sebagai penerima sambaran, dan bentuknya Berupa sangkar elektris atau biasa disebut sangkar Faraday.
2. Penangkal Petir Radio Aktif
Penelitian terus terus berkembang dan dihasilkan kesimpulan bahwa petir telah terjadi karena ada muatan listrik di awan dihasilkan oleh proses ionisasi , maka penggagalan proses ionisasi di lakukan dengan cara memakai Zat beradiasi misl. Radiun 226 dan Ameresium 241 , karena 2 bahan ini juga mampu menghamburkan ion radiasinya yang bisa menetralkan muatan listrik awan.
Sedang manfaat lain adalah hamburan ion radiasi akan dapat menambah muatan pada Ujung Finial / Splitzer dan bila mana awan yang bermuatan besar tidak mampu di netralkan oleh zat radiasi kemudian menyambar, maka akan condong mengenai unit radiasi ini .
Keberadaan penangkal petir jenis ini juga sudah dilarang pemakaiannya , berdasarkan kesepakatan internasional dengan pertimbangan mengurangi pemakaian zat beradiasi dimasyarakat yang disinyalir mempunyai efek negatif pada lingkungan hidup dan kesehatan.
3. Penangkal Petir Elektrostatic
Prinsip kerja penangkal petir Elektrostatik adalah dengan mengadopsi sebagian system penangkal petir Radioaktif , yakni dengan menambah muatan pada ujung finial / splitzer agar petir selalu memilih ujung ini untuk disambar .
Perbedaan dari sisten Radioaktif dan Elektrostatik ada pada energi yang dipakai. Untuk Penangkal Petir Radioaktif muatan listrik dihasilkan dari proses hamburan zat beradiasi sedangkan pada penangkal petir elektrostatik energi listrik dihasilkan dari Listrik Awan yang menginduksi permukaan bumi.
CARA KERJA PENANGKAL PETIR NEOFLASH

Mekanisme Kerja
Ketika awan bermuatan listrik telah melintas diatas sebuah bangunan yang terpasang penangkal petir neoFlash, maka elektroda penerima pada bagian samping NeoFLASH ini dapat mengumpulkan dan menyimpan energi listrik awan pada unit kapasitornya . Setelah energi ini cukup besar maka dilepas dan diperbesar beda potensialnya pada bagian Ion Generator.
Pelepasan muatan listrik pada unit Ion Generator ini di picu oleh sambaran, yakni ketika lidah api menyambar permukaan bumi maka semua muatan listrik di bagian ion generator dilepaskan keudara melalui Central Pick Up agar menimbulkan lidah api penuntun keatas ( Streamer leader ) untuk dapat menyambut sambaran petir yang terjadi kemudian menuntunya masuk kedalam satu titik sambar yang terdapat unit Neoflash ini.
Kerja Simultan
Pada unit Penangkal Petir NEOFLASH secara simultan bekerja bergantian dari masing-masing unit penerima induksi , jumlahnya tergantung dari tipe dan modelnya. Bekerjanya secara bergantian dimana bila salah satu bagian unit melepaskan muatan ke udara / streamer maka ada bagian lain yang dalam proses pengisian muatan awan.
Tentu akurasi dan kemampuan Penangkal Petir NeoFlash masih tergantung dari 2 hal pendukung instalasi, yaitu:
1. Kabel Penghantar harus minimal 50 mm
2. Grounding maksimal 5 Ohm
Bila 2 syarat pendukung ini juga sudah terpenuhi maka kemampuan penangkal petir neoflash akan maksimal.
ISTILAH PENANGKAL PETIR & ANTI PETIR

Penangkal Petir dan Anti Petir mungkin itu adalah istilah yang sudah salah kaprah dalam bahasa kita, kesan yang ditimbulkan dua istilah ini adalah aman 100 % terhadap petir, akan tetapi kejadiannya tidak demikian.
Dalam penanganan bahaya petir memang ada beberapa faktor yang sangat mempengaruhi, bilamana kita ingin solusi/penyelesaian total akan bahaya petir, kita harus melihat faktor faktor tersebut.
Sambaran Tidak langsung pada bangunan yakni ketika sambaran mengenai obyek diluar areal perlindungan dari penangkal petir yang terpasang , kemudian arus petir ini akan merambat melalui instalasi listrik , kabel data atau apa saja mengarah ke bangunan. Akhirnya hentakan tegangan dan arus merusak unit peralatan listrik / elektronik kita.
Masalah ini juga semakin runyam disaat ini karena banyak peralatan elektronik dengan menggunakan tegangan kerja kecil , DC , dan sensitif, Khususnya di urusan data transfer.
Maka pada dasarnya pengaman sambaran petir langsung / Eksternal penangkal petir bukan membuat posisi kita aman 100 % terhadap petir, akan tetapi membuat posisi bangunan kita terhindar dari kerusakan fatal akibat sambaran Langsung, serta meminimalisir efek kerusakan pada peralatan elektronik bila ada sambaran menyambar bangunan kita.
mungkin Penyalur Arus Petir adalah istilah tepatnya.
Masih ada kemungkinan lain yakni sambaran petir tidak langsung , yakni sambaran yang pada dasarnya tidak mengenai lokasi bangunan tetapi mengenai jauh diluar lokasi tetapi lonjakan listriknya merambat masuk ke jaringan instalasi listrik di bangunan dan merusak peralatan elektronik, Untuk penanganan sambaran petir tidak langsung dapat digunakan Arrester yakni perangkat yang bisa memotong dan membelokkan lonjakan arus / tegangan petir ke dalam grounding .

Editor : Dian Sukmawati

David Goldman/Associated Press

National Guard soldiers boarding a truck in Baltimore on Sunday.

Baltimore residents prepared to resume the more familiar rhythms of their lives as days passed without new bouts of widespread rioting and as the National Guard began to pull its troops from the city.

In Baltimore, National Guard Pullout Begins as Citywide Curfew Is Lifted

Mr. Haroche was a founder of Liberty Travel, which grew from a two-man operation to the largest leisure travel operation in the United States.

y NEIL GENZLINGER

Frontline

Frontline An installment of this PBS program looks at the effects of Ebola on Liberia and other countries, as well as the origins of the outbreak.

The program traces the outbreak to its origin, thought to be a tree full of bats in Guinea.

Mr. Tepper was not a musical child and had no formal training, but he grew up to write both lyrics and tunes, trading off duties with the other member of the team, Roy C. Bennett.

Mr. Mankiewicz, an Oscar-nominated screenwriter for “I Want to Live!,” also wrote episodes of television shows such as “Star Trek” and “Marcus Welby, M.D.”

The magical quality Mr. Lesnie created in shooting the “Babe” films caught the eye of the director Peter Jackson, who chose him to film the fantasy epic.

ate in February, Dr. Ben Carson, the celebrated pediatric neurosurgeon turned political insurrectionist, was trying to check off another box on his presidential-campaign to-do list: hiring a press secretary. The lead prospect, a public-relations specialist named Deana Bass, had come to meet him at the dimly lit Capitol Hill office of Carson’s confidant and business manager, Armstrong Williams. Carson sat back and scrutinized her from behind a small granite table, as life-size cardboard cutouts of more conventional politicians — President Obama, with a tight smile, and Senator John McCain, glowering — loomed behind each of his shoulders. (The mock $3 bill someone had left on a table in Williams’s waiting room undercut any notion that this was a bipartisan zone; it featured Obama wearing a turban.)

Bass seemed momentarily speechless, and not just because no one had warned her that a New York Times reporter would be sitting in on her job interview. Though she knew Williams — a jack-of-all-trades entrepreneur who owns several television stations and a public-affairs business and who hosts a daily talk-radio show — through Washington’s small circle of black conservatives, the two hadn’t spoken in years until he called her two days earlier. He had been struggling to come up with the perfect national spokesperson, he told her. Then, at the gym, her name popped into his head; Williams was fairly certain she was the one. Sitting across from a likely candidate for president, Bass was adjusting to the idea that her life might be about to take a sudden chaotic turn.

“It’s like getting the most random call on a Monday that you simply do not see coming,” she said. “Oftentimes, that is how the Lord works.”

Carson concurred: “It’s always how he works in my life.” Carson is soft-spoken and often talks with his eyes half closed, frequently punctuating his sentences with a small laugh, even if the humor of his statement is not readily apparent. Bass told Carson that she had been a Republican staff member on Capitol Hill then worked for the Republican National Committee. In 2007 she started a Christian public-relations firm with her sister. She enjoyed working on the Hill, she said, but the pay wasn’t as high as the hours were long. “We figured that we worked like slaves for other people, and we wanted to work for ourselves.”

Carson stopped her. “You know you can’t mention that word, right?” Carson waited a beat, then laughed, and Williams and Bass joined in. He was getting to the point; he needed a professional who could help him check his penchant for creating uncontrolled controversy just by talking.

The Ben Carson movement began in 2013, when Carson, a neurosurgeon, whose operating-room prowess and up-from-poverty back story had made him the subject of a television movie and a regular on the inspirational-speaking circuit, was invited to address the annual National Prayer Breakfast in Washington. With Barack Obama sitting just two seats away, Carson warned that “moral decay” and “fiscal irresponsibility” could destroy America just as it did ancient Rome. He proposed a substitute for Obamacare — Health Savings Accounts, which, he said, would end any talk of “death panels” — and a flat-tax based on the concept of tithing. His address, combined with the president’s stony reaction, was a smash with Republican activists. Speaking and interview requests flooded in. Carson, then 61, announced his planned retirement a few weeks later, freeing his calendar to accept just about all of them. In the months that followed, his rhetoric became increasingly strident. The claim that drew the most attention, perhaps, was that Obamacare was “the worst thing that has happened in this nation since slavery.”

Bass’s own use of the word prompted Carson to ask her what she thought about that incident. She considered for a moment.

“If you want to reach people and have them even understand what you’re saying, there is a way to do it, without that hyperbole, that might be. . . . ” She paused. “I just think it’s important not to shut people off before they —”

Carson jumped in. “That doesn’t allow them to hear what you’re saying?”

Bass nodded.

Likening Obamacare to slavery — and slavery was incomparably worse, Carson said — had its political advantages for a candidacy like his. It was the kind of statement that stoked the angriest of the Republican voters: conservative stalwarts who can’t hear enough bad things about Obama. This, in turn, led to more talk-radio and Fox News appearances, more book sales, more donations to the super PAC started in his name, more support in the polls. (The day before the meeting, one poll of Republican voters showed Carson statistically tied for first place with Jeb Bush and Scott Walker.)

Rhetorical excess was good for business, but Carson now wants to be seen as more than a novelty candidate. He has come to learn that such extreme analogies, while true to his views, aren’t especially presidential. They alienate more moderate voters and, perhaps even more damaging, reinforce the impression that he is not “serious” — that he is another Herman Cain, the black former Godfather’s Pizza chief executive who rose to the top of the early presidential polls in 2011 but then bowed out before the Iowa caucuses, largely because of leaked allegations of sexual misconduct, which he denied but from which he never recovered. Cain lingers as a cautionary tale for the party as much as for a right-leaning candidate like Carson. The fact that Cain, with his folksy sayings (“shucky ducky”) and misnomers (“Ubeki-beki-beki-beki-stan-stan”), reached the top of the national polls — much less that he was eventually followed there by the likes of Michele Bachmann, Newt Gingrich and Rick Santorum, who all topped one or another poll in the 2012 primary season — wound up being a considerable embarrassment for the eventual nominee, Mitt Romney, and for the longtime party regulars who were trying to fast-track his way to the nomination.

Carson liked Bass and, without directly saying so, made it clear the job was hers for the taking. Carson’s campaign chairman, Terry Giles — a white lawyer whose clients have included the comedian Richard Pryor and the stepson of the model Anna Nicole Smith and who helped reconcile the business interests of the descendants of the Rev. Martin Luther King Jr. — had assembled a mostly white campaign team, including many from the 2012 Gingrich effort, and Carson wanted a person of color to speak for him. Bass said she would have to mull it over, pray about it. Carson nodded approvingly. “Pray about it,” he said. “See what you think.”

Williams knew the party was intent on protecting the eventual 2016 nominee from the same embarrassment Romney suffered. Already, suspiciously tough articles about Carson were showing up in conservative magazines and on right-wing websites. “They’re protecting these establishment candidates,” Williams said. “This is coming from within the house. This is family.” At the very least, he wanted to make sure that Carson didn’t do their work for them. (Carson would commit another unforced error a week later, when he told CNN that homosexuality was clearly a choice, because a lot of people go in prison straight and “when they come out, they’re gay”; he later apologized.)

“We need somebody to protect him, sometimes, from himself,” he told Bass — laughing, but only half kidding.

A candidacy like Carson’s presents a new kind of problem to the establishment wing of the G.O.P., which, at least since 1980, has selected its presidential nominees with a routine efficiency that Democrats could only envy. The establishment candidate has usually been a current or former governor or senator, blandly Protestant, hailing from the moderate, big-business wing of the party (or at least friendly with it) and almost always a second-, third- or fourth-time national contender — someone who had waited “his turn.” These candidates would tack predictably to the right during the primaries to satisfy the evangelicals, deficit hawks, libertarian leaners and other inconvenient but vital constituents who made up the “base” of the party. In return, the base would, after a brief flirtation with some fantasy candidate like Steve Forbes or Pat Buchanan, “hold their noses” and deliver their votes come November. This bargain was always tenuous, of course, and when some of the furthest-right activists turned against George W. Bush, citing (among other apostasies) his expansion of Medicare’s prescription drug benefit, it began to fall apart. After Barack Obama defeated McCain in 2008, the party’s once dependable base started to reconsider the wisdom of holding their noses at all.

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This insurgent attitude was helped along by changes in the nomination rules. In 2010, the Republican National Committee, hoping to capture the excitement of the coast-to-coast Democratic primary competition between Obama and Hillary Clinton, introduced new voting rules that required many of the early voting states to award some delegates to losing candidates, based on their shares of the vote. The proportional voting rules would encourage struggling candidates to stay in the primaries even after successive losses, as Clinton did, because they might be able to pull together enough delegates to take the nomination in a convention-floor fight or at least use them to bargain for a prime speaking slot or cabinet post.

This shift in incentives did not go unnoticed by potential 2012 candidates, nor did changes in election law that allowed billionaire donors to form super PACs in support of pet candidacies. At the same time, increasingly widespread broadband Internet access allowed candidates to reach supporters directly with video and email appeals and supporters to send money with the tap of a smartphone, making it easier than ever for individual candidates to ignore the wishes of the party.

Into this newly chaotic Republican landscape strode Mitt Romney. There could be no doubt that it was his turn, and yet his journey to the nomination was interrupted by one against-the-odds challenger after another — Cain, Michele Bachmann, Newt Gingrich, Rick Santorum, Ron Paul; always Ron Paul. It was easy to dismiss the 2012 primaries as a meaningless circus, but the onslaught did much more than tarnish the overall Republican brand. It also forced Romney to spend money he could have used against Obama and defend his right flank with embarrassing pandering that shadowed him through the general election. It was while trying to block a surge from Gingrich, for instance, that Romney told a debate audience that he was for the “self-deportation” of undocumented immigrants.

At the 2012 convention in Tampa, a group of longtime party hands, including Romney’s lawyer, Ben Ginsberg, gathered to discuss how to prevent a repeat of what had become known inside and outside the party as the “clown show.” Their aim was not just to protect the party but also to protect a potential President Romney from a primary challenge in 2016. They forced through new rules that would give future presumptive nominees more control over delegates in the event of a convention fight. They did away with the mandatory proportional delegate awards that encouraged long-shot candidacies. And, in a noticeably targeted effort, they raised the threshold that candidates needed to meet to enter their names into nomination, just as Ron Paul’s supporters were working to reach it. When John A. Boehner gaveled the rules in on a voice vote — a vote that many listeners heard as a tie, if not an outright loss — the hall erupted and a line of Ron Paul supporters walked off the floor in protest, along with many Tea Party members.

At a party meeting last winter, Reince Priebus, who as party chairman is charged with maintaining the support of all his constituencies, did restore some proportional primary and caucus voting, but only in states that held voting within a shortened two-week window. And he also condensed the nominating schedule to four and a half months from six months, and, for the first time required candidates to participate in a shortened debate schedule, determined by the party, not by the whims of the networks. (The panel that recommended those changes included names closely identified with the establishment — the former Bush White House spokesman Ari Fleischer, the Mississippi committeeman Haley Barbour and, notably, Jeb Bush’s closest adviser, Sally Bradshaw.)

Grass-roots activists have complained that the condensed schedule robs nonestablishment candidates — “movement candidates” like Carson — of the extra time they need to build momentum, money and organizations. But Priebus, who says the nomination could be close to settled by April, said it helped all the party’s constituencies when the nominee was decided quickly. “We don’t need a six-month slice-and-dice festival,” Priebus said when we spoke in mid-March. “While I can’t always control everyone’s mouth, I can control how long we can kill each other.”

All the rules changes were built to sidestep the problems of 2012. But the 2016 field is shaping up to be vastly different and far larger. A new Republican hints that he or she is considering a run seemingly every week. There are moderates like Gov. John Kasich of Ohio and former Gov. George Pataki of New York; no-compromise conservatives like Senator Ted Cruz of Texas and former Senator Rick Santorum of Pennsylvania; business-wingers like the former Hewlett-Packard chief executive Carly Fiorina; one-of-a-kinds like Donald Trump — some 20 in all, a dozen or so who seem fairly serious about it. That opens the possibility of multiple candidates vying for all the major Republican constituencies, some of them possibly goaded along by super-PAC-funding billionaires, all of them trading wins and collecting delegates well into spring.

Giles says his candidate can capitalize on all that chaos. Rivals may laugh, but Giles argues that if Carson can make a respectable showing in Iowa, then win in South Carolina — or at least come in second should a home-state senator, Lindsey Graham, run — and come in second behind Bush or Senator Marco Rubio in their home state of Florida, he could be positioned to make a real run. But that would depend on avoiding pitfalls like Carson’s ill-considered comments on homosexuality. Rather than capitalizing on the chaos, Carson may only contribute to it.

Ben Carson is, in many ways, the ideal Republican presidential candidate. With a not-too-selective reading of his life story, conservative voters can — and do — see in him an inspiring, up-from-nowhere African-American who shares their beliefs, a right-wing answer to Barack Obama. Before he was born, his parents moved to Detroit from rural Tennessee as part of the second great migration. His father, Robert Solomon Carson, worked at a Cadillac factory. His mother, Sonya — who herself had grown up as one of 24 children and left school at third grade — cleaned houses. When Carson was 8, Sonya discovered that Robert was keeping a second family. She moved, with her two sons, into a rundown group house. It was in a part of town that Carson described to me as crawling with “big rats and roaches and all kinds of horrible things.” Sonya worked several jobs at a time and made up the shortfall with food stamps. (Carson has called for paring back the social safety net but not doing away with it.)

Carson recounts this story in his best-selling 1990 memoir, “Gifted Hands,” which also became the basis for a 2009 movie on TNT, starring Cuba Gooding Jr. as Carson. Raised as a Seventh Day Adventist, Carson realized that he wanted to become a physician during a church sermon about a missionary doctor who, while serving overseas, was almost attacked by thieves but found safety by putting his faith in God. When Carson, then 8, told his mother his new dream, “She said, ‘Absolutely, you could do it, you could do anything,’ ” he told me. Forced by his mother to read two extra books a week, he made it to Yale, then to medical school at the University of Michigan, where he decided to specialize in neurosurgery. He was selected for residency at Johns Hopkins Children’s Center, where he was named director of pediatric neurosurgery at 33, becoming the youngest person, and the first black person, to hold the title. He drew national attention by conducting a succession of operations that had never been performed successfully, most famously planning and managing the first separation of conjoined twins connected through major blood vessels in the brain.

Carson, a two-time Jimmy Carter voter, traces his conservative political awakening to a patient he met during the Reagan years. During a routine obstetrics rotation, he found himself treating an unwed pregnant teenager who had run away from her well-to-do parents. When Carson asked her how she was getting by, she informed him she was on public assistance; this led him to ponder the fact that the government was paying for the result of what he did not view as a “wise decision.” The incident, he says, fed his growing sense that the welfare system too often saps motivation and rewards irresponsible behavior. (When we spoke, he suggested that the government should cut off assistance to would-be unwed mothers, but only after warning them that it would do so within a certain amount of time, say five years. “I bet you’d see a dramatic decrease in unwed motherhood.”)

Carson’s friends at Hopkins say they do not remember him being particularly outspoken about his conservatism. He devoted most of his public engagement to urging poor kids in bad neighborhoods to use “these fancy brains God gave us,” through weekly school visits, student hospital tours and, ultimately, a multimillion-dollar scholarship program. “His issues were always medical care for the poor, education for the poor, equal opportunity — helping the less fortunate and really inspiring them as an example,” a mentor who named him to the chief pediatrics-neurosurgery post at Hopkins, Dr. Donlin Long, told me.

Even when Carson got the chance, in 1997, to speak in front of President Bill Clinton, at the national prayer breakfast, he mostly discussed the lack of role models for black children who were not sports stars or rappers. (There was possibly an oblique reference to Clinton’s sex scandals, when he told the audience that, if they are always honest, they won’t have to worry later about “skeletons in the closet.”)

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In 2011, Carson’s politics took a strident turn, mirroring that of many in his party during the Obama years. “America the Beautiful,” his sixth book, which he wrote with Candy Carson, his wife of 39 years, included a get-tough-on-illegal-immigration message and offered anti-establishment praise for the Tea Party. It suggested that blacks who voted for Obama only because he was black were themselves practicing a form of racism. (Earlier this year he admitted to Buzzfeed that portions of the book were lifted directly from several sources without proper attribution.) His prayer-breakfast performance in 2013, and the extremity of his remarks in the months afterward (Obamacare is the worst thing since slavery; the United States is “very much like Nazi Germany”; allowing same-sex marriage could lead to allowing bestiality), left some of his old friends bewildered. Students at Johns Hopkins University School of Medicine protested his planned convocation address there in 2013, and he eventually backed out. When I asked Carson about the view at Hopkins that he had changed, he said his themes are still the same: “hard work, self-reliance, helping other people.” If he had become more overtly political, he said, it was only because the Obama years had led him to believe that “we’re really moving in a direction that is very, very destructive.”

None of this went unnoticed by campaign professionals. In August 2013, John Philip Sousa IV and Vernon Robinson, each of whom professes to be a virtual stranger to Carson, and who had previously been active in the anti-illegal-immigration movement, started the National Draft Ben Carson for President Committee. Sousa was just coming off a campaign to defend the sheriff of Maricopa County, Arizona, Joe Arpaio, from a recall effort, and he told me that he found Carson’s lack of political experience refreshing. “We have 500 guys and gals with probably a collective 5,000 years experience, and look at the mess we’re in,” he said.

Many others in the party feel the same way. Carson’s PAC finished 2014 with more than $13 million in donations, more than Ready for Hillary. Much of its money has gone toward further fund-raising, but Sousa — the great-grandson of the famous composer — points out that their effort has already built far more than just a war chest, organizing leaders in all 99 of Iowa’s counties. Regardless, Carson credits the fund-raising success of Sousa and Robinson with persuading him to enter the race.

Very early the morning after the job interview, Carson was in a black S.U.V., heading from Washington to the Gaylord National Resort and Convention Center in Oxon Hill, Md., where he was to give the opening candidate speech of the Conservative Political Action Conference. The event, which functions as an early tryout for Republican presidential contenders, tends to skew rightward in its audience, drawing many of the same sorts of people who shouted at Boehner in Tampa. As such, it tends to favor anti-establishment candidates, but the news leading up to this year’s event was that Jeb Bush hoped to make inroads there.

It was still dark when we set out, and I joked with Carson about the hour, telling him he’d better get used to it. He retorted that his career in pediatric brain surgery made him no stranger to early mornings. This is a big theme of Carson’s presidential pitch: that neither the rigors of the campaign nor those of the White House can faze a man who held children’s lives in his hands. His life in brain surgery has prepared him for the presidency, he maintains, better than lives in politics have for his rivals. At the very least, he says, it conditioned him against getting too worked up about any problem that isn’t life threatening. “I mean, it’s grueling, but interestingly enough, I don’t feel the pressure,” he said.

At the convention hall, we were quickly surrounded by admirers. Two women were already waiting to meet him — white, middle-aged volunteers for Carson’s super PAC, who had traveled from South Carolina. One of them, Chris Horne, was holding a dog-eared and taped Bible. A founding member of the Charleston Tea Party who went on to work for Gingrich’s successful South Carolina primary campaign in 2012, Horne lamented over the attacks that Carson was sure to face. “You served us, you served the Lord, just don’t let them steal that from you,” she said. Her friend told him, “You’ve got God behind you!” Such religious evocations trailed Carson constantly while I walked the CPAC floor with him. Evangelicals are impressed not only with his devotion to their politics but also with his career path; as one of them told me, what’s more pro-life than saving babies?

During our ride to the conference, Carson told me his speech was not looking to “feed the beast.” When his appointed time came, he kept his remarks as tame as promised. “Real compassion” meant “using our intellect” to help people “climb out of dependency and realize the American dream,” he said. The national debt is going to “destroy us,” Obamacare was about “redistribution and control,” but Republicans better come forward with their own alternative before they repeal it, he said.

Because his speech was first, and it started several minutes early, the auditorium was slow to fill. Still, the first day saw a crush of people seeking autographs and pictures as he roamed the hall. The Draft Carson committee’s 150 volunteers swarmed the auditorium, collecting emails and handing out “Run Ben Run” stickers. After a quick interview with Sean Hannity, the conservative-radio and Fox News host — his second in two days — Carson was off to Tampa.

In the hours that followed his talk, the hall offered a view in miniature of what the next 12 to 14 months might hold for the party. Chris Christie, sitting across from the tough-minded talk-radio host Laura Ingraham, boasted about his multiple vetoes of Planned Parenthood funding, his refusal to raise income taxes and his belief that “sometimes people need to be told to sit down and shut up.” Cruz, an audience favorite, warning his fellow Republicans against falling for a “squishy moderate,” declared, “Take all 125,000 I.R.S. agents and put ’em on our Southern border!” Gov. Scott Walker of Wisconsin, surging in polls, boasted that if he could face down the 100,000 union supporters who protested his legislation limiting collective bargaining for public employees, he could certainly handle ISIS. The next day, the traditional CPAC favorite Rand Paul spoke, packing the hall with his supporters who chanted “President Paul.” He warned, counter to the overall hawkish tenor of the event, that “we should not succumb to the notion that a government inept at home will somehow become successful abroad.” But he also vowed to end foreign aid to countries whose citizens are seen burning American flags. “Not one penny more to these haters of America.”

Perhaps the defining moment came near the end of the conference, when Jeb Bush spoke. In a neat trick of political gamesmanship — and a show of establishment muscle — his team had bused in an ample cheering section for the dozens of cameras on hand for his appearance. But a small contingent of Tea Party activists and Rand Paul supporters staged a walk out. When Bush began a question-and-answer session, they turned and left the auditorium to chant “U.S.A., U.S.A.” in the hallway, led by a man in colonial garb waving a huge “Don’t Tread on Me” banner. Plenty of other detractors stayed in the hall and peppered Bush’s remarks with booing as he stood by positions unpopular with the conservative grass roots: support for the Common Core standards and an immigration overhaul that provides a “path to legal status” for undocumented immigrants. Bush took it all in good humor, but finally seemed to give up.

“For those who made an ‘oo’ sound — is that what it was? — I’m marking you down as neutral,” he said. “And I want to be your second choice.”

Bush strategists told me they would not repeat Romney’s mistakes. Of course they would love to glide to an early nomination, they said, but they are prepared for a long contest and won’t be wasting any energy bending under pressure from a Paul or a Cruz or a Carson.

No one doubts that the pressure will increase, though. Despite the best wishes of the party’s leaders, GOP primary voters have given little indication that they will narrow the field quickly.

Before I left, I spotted Newt Gingrich, himself a fleeting presidential front-runner during those strange primary days of 2012. I asked him whether he thought all the party maneuvering — all the attempts to change the rules and fast-track the process — would preclude someone from presenting the sort of outside primary challenge he had carried out in the last election.

“No,” he told me, as if it was the most obvious thing in the world. “Look at where Ben Carson is right now.”

Mr. Miller, of the firm Weil, Gotshal & Manges, represented companies including Lehman Brothers, General Motors and American Airlines, and mentored many of the top Chapter 11 practitioners today.

Mr. Paczynski was one of the concentration camp’s longest surviving inmates and served as the personal barber to its Nazi commandant Rudolf Höss.

The 6-foot-10 Phillips played alongside the 6-11 Rick Robey on the Wildcats team that won the 1978 N.C.A.A. men’s basketball title.

Judge Patterson helped to protect the rights of Attica inmates after the prison riot in 1971 and later served on the Federal District Court in Manhattan.

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Last summer at a writers’ workshop in Oregon, the novelists Anthony Doerr, Karen Russell and Elissa Schappell were chatting over cocktails when they realized they had all published work in the same magazine. It wasn’t one of the usual literary outlets, like Tin House, The Paris Review or The New Yorker. It was Rhapsody, an in-flight magazine for United Airlines.

It seemed like a weird coincidence. Then again, considering Rhapsody’s growing roster of A-list fiction writers, maybe not. Since its first issue hit plane cabins a year and a half ago, Rhapsody has published original works by literary stars like Joyce Carol Oates, Rick Moody, Amy Bloom, Emma Straub and Mr. Doerr, who won the Pulitzer Prize for fiction two weeks ago.

As airlines try to distinguish their high-end service with luxuries like private sleeping chambers, showers, butler service and meals from five-star chefs, United Airlines is offering a loftier, more cerebral amenity to its first-class and business-class passengers: elegant prose by prominent novelists. There are no airport maps or disheartening lists of in-flight meal and entertainment options in Rhapsody. Instead, the magazine has published ruminative first-person travel accounts, cultural dispatches and probing essays about flight by more than 30 literary fiction writers.

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An airline might seem like an odd literary patron. But as publishers and writers look for new ways to reach readers in a shaky retail climate, many have formed corporate alliances with transit companies, including American Airlines, JetBlue and Amtrak, that provide a captive audience.

Mark Krolick, United Airlines’ managing director of marketing and product development, said the quality of the writing in Rhapsody brings a patina of sophistication to its first-class service, along with other opulent touches like mood lighting, soft music and a branded scent.

“The high-end leisure or business-class traveler has higher expectations, even in the entertainment we provide,” he said.

Some of Rhapsody’s contributing writers say they were lured by the promise of free airfare and luxury accommodations provided by United, as well as exposure to an elite audience of some two million first-class and business-class travelers.

“It’s not your normal Park Slope Community Bookstore types who read Rhapsody,” Mr. Moody, author of the 1994 novel “The Ice Storm,” who wrote an introspective, philosophical piece about traveling to the Aran Islands of Ireland for Rhapsody, said in an email. “I’m not sure I myself am in that Rhapsody demographic, but I would like them to buy my books one day.”

In addition to offering travel perks, the magazine pays well and gives writers freedom, within reason, to choose their subject matter and write with style. Certain genres of flight stories are off limits, naturally: no plane crashes or woeful tales of lost luggage or rude flight attendants, and nothing too risqué.

“We’re not going to have someone write about joining the mile-high club,” said Jordan Heller, the editor in chief of Rhapsody. “Despite those restrictions, we’ve managed to come up with a lot of high-minded literary content.”

Guiding writers toward the right idea occasionally requires some gentle prodding. When Rhapsody’s executive editor asked Ms. Russell to contribute an essay about a memorable flight experience, she first pitched a story about the time she was chaperoning a group of teenagers on a trip to Europe, and their delayed plane sat at the airport in New York for several hours while other passengers got progressively drunker.

“He pointed out that disaster flights are not what people want to read about when they’re in transit, and very diplomatically suggested that maybe people want to read something that casts air travel in a more positive light,” said Ms. Russell, whose novel “Swamplandia!” was a finalist for the 2012 Pulitzer Prize.

She turned in a nostalgia-tinged essay about her first flight on a trip to Disney World when she was 6. “The Magic Kingdom was an anticlimax,” she wrote. “What ride could compare to that first flight?”

Ms. Oates also wrote about her first flight, in a tiny yellow propeller plane piloted by her father. The novelist Joyce Maynard told of the constant disappointment of never seeing her books in airport bookstores and the thrill of finally spotting a fellow plane passenger reading her novel “Labor Day.” Emily St. John Mandel, who was a finalist for the National Book Award in fiction last year, wrote about agonizing over which books to bring on a long flight.

“There’s nobody that’s looked down their noses at us as an in-flight magazine,” said Sean Manning, the magazine’s executive editor. “As big as these people are in the literary world, there’s still this untapped audience for them of luxury travelers.”

United is one of a handful of companies showcasing work by literary writers as a way to elevate their brands and engage customers. Chipotle has printed original work from writers like Toni Morrison, Jeffrey Eugenides and Barbara Kingsolver on its disposable cups and paper bags. The eyeglass company Warby Parker hosts parties for authors and sells books from 14 independent publishers in its stores.

JetBlue offers around 40 e-books from HarperCollins and Penguin Random House on its free wireless network, allowing passengers to read free samples and buy and download books. JetBlue will start offering 11 digital titles from Simon & Schuster soon. Amtrak recently forged an alliance with Penguin Random House to provide free digital samples from 28 popular titles, which passengers can buy and download over Amtrak’s admittedly spotty wireless service.

Amtrak is becoming an incubator for literary talent in its own right. Last year, it started a residency program, offering writers a free long-distance train trip and complimentary food. More than 16,000 writers applied and 24 made the cut.

Like Amtrak, Rhapsody has found that writers are eager to get onboard. On a rainy spring afternoon, Rhapsody’s editorial staff sat around a conference table discussing the June issue, which will feature an essay by the novelist Hannah Pittard and an unpublished short story by the late Elmore Leonard.

“Do you have that photo of Elmore Leonard? Can I see it?” Mr. Heller, the editor in chief, asked Rhapsody’s design director, Christos Hannides. Mr. Hannides slid it across the table and noted that they also had a photograph of cowboy spurs. “It’s very simple; it won’t take away from the literature,” he said.

Rhapsody’s office, an open space with exposed pipes and a vaulted brick ceiling, sits in Dumbo at the epicenter of literary Brooklyn, in the same converted tea warehouse as the literary journal N+1 and the digital publisher Atavist. Two of the magazine’s seven staff members hold graduate degrees in creative writing. Mr. Manning, the executive editor, has published a memoir and edited five literary anthologies.

Mr. Manning said Rhapsody was conceived from the start as a place for literary novelists to write with voice and style, and nobody had been put off that their work would live in plane cabins and airport lounges.

Still, some contributors say they wish the magazine were more widely circulated.

“I would love it if I could read it,” said Ms. Schappell, a Brooklyn-based novelist who wrote a feature story for Rhapsody’s inaugural issue. “But I never fly first class.”

Mr. Bartoszewski was given honorary Israeli citizenship for his work to save Jews during World War II and later surprised even himself by being instrumental in reconciling Poland and Germany.

Ms. Crough played the youngest daughter on the hit ’70s sitcom starring David Cassidy and Shirley Jones.

As he reflected on the festering wounds deepened by race and grievance that have been on painful display in America’s cities lately, President Obama on Monday found himself thinking about a young man he had just met named Malachi.

A few minutes before, in a closed-door round-table discussion at Lehman College in the Bronx, Mr. Obama had asked a group of black and Hispanic students from disadvantaged backgrounds what could be done to help them reach their goals. Several talked about counseling and guidance programs.

“Malachi, he just talked about — we should talk about love,” Mr. Obama told a crowd afterward, drifting away from his prepared remarks. “Because Malachi and I shared the fact that our dad wasn’t around and that sometimes we wondered why he wasn’t around and what had happened. But really, that’s what this comes down to is: Do we love these kids?”

Many presidents have governed during times of racial tension, but Mr. Obama is the first to see in the mirror a face that looks like those on the other side of history’s ledger. While his first term was consumed with the economy, war and health care, his second keeps coming back to the societal divide that was not bridged by his election. A president who eschewed focusing on race now seems to have found his voice again as he thinks about how to use his remaining time in office and beyond.

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Obama Speaks of a ‘Sense of Unfairness’

In the aftermath of racially charged unrest in places like Baltimore, Ferguson, Mo., and New York, Mr. Obama came to the Bronx on Monday for the announcement of a new nonprofit organization that is being spun off from his White House initiative called My Brother’s Keeper. Staked by more than $80 million in commitments from corporations and other donors, the new group, My Brother’s Keeper Alliance, will in effect provide the nucleus for Mr. Obama’s post-presidency, which will begin in January 2017.

“This will remain a mission for me and for Michelle not just for the rest of my presidency but for the rest of my life,” Mr. Obama said. “And the reason is simple,” he added. Referring to some of the youths he had just met, he said: “We see ourselves in these young men. I grew up without a dad. I grew up lost sometimes and adrift, not having a sense of a clear path. The only difference between me and a lot of other young men in this neighborhood and all across the country is that I grew up in an environment that was a little more forgiving.”

Organizers said the new alliance already had financial pledges from companies like American Express, Deloitte, Discovery Communications and News Corporation. The money will be used to help companies address obstacles facing young black and Hispanic men, provide grants to programs for disadvantaged youths, and help communities aid their populations.

Joe Echevarria, a former chief executive of Deloitte, the accounting and consulting firm, will lead the alliance, and among those on its leadership team or advisory group are executives at PepsiCo, News Corporation, Sprint, BET and Prudential Group Insurance; former Secretary of State Colin L. Powell; Senator Cory Booker, Democrat of New Jersey; former Attorney General Eric H. Holder Jr.; the music star John Legend; the retired athletes Alonzo Mourning, Jerome Bettis and Shaquille O’Neal; and the mayors of Indianapolis, Sacramento and Philadelphia.

The alliance, while nominally independent of the White House, may face some of the same questions confronting former Secretary of State Hillary Rodham Clinton as she begins another presidential campaign. Some of those donating to the alliance may have interests in government action, and skeptics may wonder whether they are trying to curry favor with the president by contributing.

“The Obama administration will have no role in deciding how donations are screened and what criteria they’ll set at the alliance for donor policies, because it’s an entirely separate entity,” Josh Earnest, the White House press secretary, told reporters on Air Force One en route to New York. But he added, “I’m confident that the members of the board are well aware of the president’s commitment to transparency.”

The alliance was in the works before the disturbances last week after the death of Freddie Gray, the black man who suffered fatal injuries while in police custody in Baltimore, but it reflected the evolution of Mr. Obama’s presidency. For him, in a way, it is coming back to issues that animated him as a young community organizer and politician. It was his own struggle with race and identity, captured in his youthful memoir, “Dreams From My Father,” that stood him apart from other presidential aspirants.

But that was a side of him that he kept largely to himself through the first years of his presidency while he focused on other priorities like turning the economy around, expanding government-subsidized health care and avoiding electoral land mines en route to re-election.

After securing a second term, Mr. Obama appeared more emboldened. Just a month after his 2013 inauguration, he talked passionately about opportunity and race with a group of teenage boys in Chicago, a moment aides point to as perhaps the first time he had spoken about these issues in such a personal, powerful way as president. A few months later, he publicly lamented the death of Trayvon Martin, a black Florida teenager, saying that “could have been me 35 years ago.”

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That case, along with public ruptures of anger over police shootings in Ferguson and elsewhere, have pushed the issue of race and law enforcement onto the public agenda. Aides said they imagined that with his presidency in its final stages, Mr. Obama might be thinking more about what comes next and causes he can advance as a private citizen.

That is not to say that his public discussion of these issues has been universally welcomed. Some conservatives said he had made matters worse by seeming in their view to blame police officers in some of the disputed cases.

“President Obama, when he was elected, could have been a unifying leader,” Senator Ted Cruz of Texas, a Republican candidate for president, said at a forum last week. “He has made decisions that I think have inflamed racial tensions.”

On the other side of the ideological spectrum, some liberal African-American activists have complained that Mr. Obama has not done enough to help downtrodden communities. While he is speaking out more, these critics argue, he has hardly used the power of the presidency to make the sort of radical change they say is necessary.

The line Mr. Obama has tried to straddle has been a serrated one. He condemns police brutality as he defends most officers as honorable. He condemns “criminals and thugs” who looted in Baltimore while expressing empathy with those trapped in a cycle of poverty and hopelessness.

In the Bronx on Monday, Mr. Obama bemoaned the death of Brian Moore, a plainclothes New York police officer who had died earlier in the day after being shot in the head Saturday on a Queens street. Most police officers are “good and honest and fair and care deeply about their communities,” even as they put their lives on the line, Mr. Obama said.

“Which is why in addressing the issues in Baltimore or Ferguson or New York, the point I made was that if we’re just looking at policing, we’re looking at it too narrowly,” he added. “If we ask the police to simply contain and control problems that we ourselves have been unwilling to invest and solve, that’s not fair to the communities, it’s not fair to the police.”

Moreover, if society writes off some people, he said, “that’s not the kind of country I want to live in; that’s not what America is about.”

His message to young men like Malachi Hernandez, who attends Boston Latin Academy in Massachusetts, is not to give up.

“I want you to know you matter,” he said. “You matter to us.”