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NEW YORK, NY - NOVEMBER 09: Republican president-elect Donald Trump gives a thumbs up to the crowd during his acceptance speech at his election night event at the New York Hilton Midtown in the early morning hours of November 9, 2016 in New York City. Donald Trump defeated Democratic presidential nominee Hillary Clinton to become the 45th president of the United States. (Photo by Mark Wilson/Getty Images)

How to prepare for the Day After

By Juliette Kayyem, CNN National Security Analyst
If the transition team challenges are any indication, Juliette Kayyem writes that a Trump administration may not be prepared to handle a crisis with a steady hand and a commitment to unity.

Hamilton is Trump's dead cat

By Kate Maltby
To distract from his negative media coverage this week, Donald Trump exploited Mike Pence's Hamilton theater experience on Twitter, writes theater critic Kate Maltby.

Should Democrats cooperate with Trump?

By Julian Zelizer
Julian Zelizer writes that if Democrats are serious about rejecting bigotry, they cannot cut deals with Donald Trump, whose presidential campaign was partially premised on xenophobia and sexism.
PHNOM PENH, CAMBODIA - NOVEMBER 09: A Democratic supporter cries after Donald Trump's victory is announced on November 9, 2016 in Phnom Penh, Cambodia. Dozens of expatriated Democratic Party supporters gathered starting early in the morning at a restaurant in central Phnom Penh to follow the results of the 2016 US Presidential elections at a party organized by Democrats Abroad Cambodia. Cambodia is 12 hours ahead of the US East Coast. Approximately 3,000 Americans live in the capital Phnom Penh. (Photo by Omar Havana/Getty Images)

Where liberals will run to hide from Trump

By Andre Spicer
Like Nixon's, Donald Trump's election will make more liberals obsessed with self-development, but it could lead to narcissistic behavior, writes Andre Spicer.
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Chilled by Trump tweets? You should be

By Dean Obeidallah
His repeated lashing out at anyone who dares criticize him should worry every citizen with its implication: A President Trump may well try to suppress Americans' free speech, writes Dean Obeidallah.
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Why fake news stories thrive online

By Judith Donath
Posting fake news stories has become a form of identity politics, writes Judith Donath. To remove the appeal of fake news, people need to be comfortable debating issues with those who hold opposing views.

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                QAQORTOQ, GREENLAND - JULY 30: Calved icebergs from the nearby Twin Glaciers are seen floating on the water on July 30, 2013 in Qaqortoq, Greenland. Boats are a crucial mode of transportation in the country that has few roads. As cities like Miami, New York and other vulnerable spots around the world strategize about how to respond to climate change, many Greenlanders simply do what theyve always done: adapt. 'Were used to change, said Greenlander Pilu Neilsen. 'We learn to adapt to whatever comes. If all the glaciers melt, well just get more land. (Photo by Joe Raedle/Getty Images)
                QAQORTOQ, GREENLAND - JULY 30: Calved icebergs from the nearby Twin Glaciers are seen floating on the water on July 30, 2013 in Qaqortoq, Greenland. Boats are a crucial mode of transportation in the country that has few roads. As cities like Miami, New York and other vulnerable spots around the world strategize about how to respond to climate change, many Greenlanders simply do what theyve always done: adapt. 'Were used to change, said Greenlander Pilu Neilsen. 'We learn to adapt to whatever comes. If all the glaciers melt, well just get more land. (Photo by Joe Raedle/Getty Images)

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                  QAQORTOQ, GREENLAND - JULY 30: Calved icebergs from the nearby Twin Glaciers are seen floating on the water on July 30, 2013 in Qaqortoq, Greenland. Boats are a crucial mode of transportation in the country that has few roads. As cities like Miami, New York and other vulnerable spots around the world strategize about how to respond to climate change, many Greenlanders simply do what theyve always done: adapt. 'Were used to change, said Greenlander Pilu Neilsen. 'We learn to adapt to whatever comes. If all the glaciers melt, well just get more land. (Photo by Joe Raedle/Getty Images)

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                The most important number you've never heard of

                By John D. Sutter, CNN
                If the world warms more than 2 degrees Celsius, we're all in a lot of trouble. See how you can get involved below.

                      In Case You Missed It 

                      Official portrait of President Barack Obama in the Oval Office, Dec. 6, 2012. (Official White House Photo by Pete Souza) This official White House photograph is being made available only for publication by news organizations and/or for personal use printing by the subject(s) of the photograph. The photograph may not be manipulated in any way and may not be used in commercial or political materials, advertisements, emails, products, promotions that in any way suggests approval or endorsement of the President, the First Family, or the White House.

                      Barack Obama: America will take the giant leap to Mars

                      By Barack Obama
                      One of my earliest memories is sitting on my grandfather's shoulders, waving a flag as our astronauts returned to Hawaii. This was years before we'd set foot on the moon. Decades before we'd land a rover on Mars. A generation before photos from the International Space Station would show up in our social media feeds.
                      MADISON, WI - JUNE 28: A research specialist at the AIDS Vaccine Research Labs at the University of Wisconsin-Madison processes blood samples taken from pregnant rhesus macaque monkeys infected with the Zika virus on June 28, 2016 in Madison, Wisconsin. Researchers at the University released a study today detailing how research at the facility has found the Zika virus persisted in the blood of pregnant monkeys for 30 to 70 days but only around 7 days in others. The study also found that monkeys previously infected with the virus were resistant to a second infection, which suggests the animals have a naturally occurring immunity. Health professionals in the United States are preparing for the possibility of an epidemic of Zika which can be transmitted by mosquitoes. (Photo by Scott Olson/Getty Images)

                      Could Zika be the next HIV?

                      By Laurie Garrett
                      Global health expert Laurie Garrett evaluates the very real risk that Zika, like HIV or Ebola, will become widespread as a sexually transmitted disease
                      An all-gender restroom at Santee High School in Los Angeles, California.

                      'We need a restroom revolution'

                      By John D. Sutter, CNN
                      Before I launch into the argument for making all restrooms in the United States gender neutral -- that is, removing "men's" and "women's" labels -- I want to show you a photo.
                      LAS VEGAS, NV - FEBRUARY 02: Donald Trump speaks to members of the media before endorsing Republican presidential candidate, former Massachusetts Gov. Mitt Romney at the Trump International Hotel & Tower Las Vegas February 2, 2012 in Las Vegas, Nevada. Romney came in first in the Florida primary on January 31 and is looking ahead to Nevada's caucus on February 4. (Photo by Ethan Miller/Getty Images)

                      The four big questions about Donald Trump

                      By Michael D'Antonio
                      Now that he's likely GOP candidate, voters must scrutinize Trump's claims of success, his political beliefs, temperament and character, says Michael D'Antonio.
                      President Richard Nixon meets with Elvis Presley on December 21, 1970 at the White House.

                      Which generation has it worse?

                      Editor's Note: Generation whining has become nearly a national pastime. Millennials say they have it the worst. Generation X feels neglected. Baby boomers are tired of being called narcissistic. In articles and cartoons everywhere -- from CNN to The New York Times to Gizmodo and beyond -- critics call out this generation's sense of entitlement, that generation's self-absorption. We invited writers, activists and CNN contributors from different generations to hash it out.
                      Mosaic of the Valles Marineris hemisphere of Mars projected into point perspective, a view similar to that which one would see from a spacecraft. The distance is 2500 kilometers from the surface of the planet, with the scale being .6km/pixel. The mosaic is composed of 102 Viking Orbiter images of Mars. The center of the scene (lat -8, long 78) shows the entire Valles Marineris canyon system, over 2000 kilometers long and up to 8 kilometers deep, extending form Noctis Labyrinthus, the arcuate system of graben to the west, to the chaotic terrain to the east. Many huge ancient river channels begin from the chaotic terrain from north-central canyons and run north. The three Tharsis volcanoes (dark red spots), each about 25 kilometers high, are visible to the west. South of Valles Marineris is very ancient terrain covered by many impact craters. : NASA/JPL-Caltech

                      Is it ethical to colonize Mars?

                      By Brian Patrick Green
                      With the recent NASA announcement of liquid water flowing on Mars and the movie "The Martian" making a splash at the box office, we might well ask whether humans should go to Mars.

                      Why can't America have high-speed trains?

                      By Michael Smart
                      Imagine being able to travel from New York to Los Angeles without having to step on a plane, yet be able to do so in a fraction of the time it would take to drive. On the surface, that tantalizing prospect took a step closer with the news last month that a Japanese maglev train had reached a top speed of close to 400 mph, breaking its own world record in the process.

                      Ready for the marriage apocalypse?

                      By Carol Costello, Anchor
                      The marriage apocalypse may be coming. Talk to any millennial and you can envision an America virtually marriage-free, with everyone happily single.
                      Beautiful clouds over the sea

                      Why you don't need God

                      By Ryan Bell
                      Atheists are accused of having no source of meaning in their lives, but it is popular Christian theology that saps the meaning from our daily experiences.
                      Powerful businesswoman standing with back with business team at background.

                      Why more women choose not to marry

                      Pepper Schwartz
                      Some revolutions happen in a single day; others over decades. The rise of the voluntarily single woman has been happening in Western societies slowly, over time, concomitant with well-paying jobs, legal protection from economic or physical abuse, reliable birth control and the possibility of fulfilling careers and adventures.