Shankar Vedantam

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In the aftermath of the Las Vegas shooting, inevitably everyone turns to the question of why - why would someone do something so horrific? President Trump was asked this very question right before he boarded Marine One. And here's what he said.

Every year, many students who have overcome daunting obstacles in high school receive good news — they've been accepted to college.

These kids represent a success story: through hard work and determination, they've made into college, and perhaps even on to a better life.

Except it doesn't always work out that way.

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In 1969, Philip Zimbardo, a psychologist from Stanford University, ran an interesting field study. He abandoned two cars in two very different places: one in a mostly poor, crime-ridden section of New York City, and the other in a fairly affluent neighborhood of Palo Alto, Calif. Both cars were left without license plates and parked with their hoods up.

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Americans have long expressed their political views with their wallets, but in recent months, this phenomenon has made national news. A campaign called #grabyourwallet has targeted brands affiliated with Donald Trump.

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Imagine a concrete room, not much bigger than a parking space. No window. You're in there 23 hours a day, 7 days a week; you don't know when you'll get out of this room. A month? A year? A decade?

Our minds don't do well with that kind of solitude and uncertainty.

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All right. We've been hearing a lot about the Republican plan to replace the Affordable Care Act. Let's turn now to NPR's social science correspondent Shankar Vedantam to talk about some research that gives us a new data point in this conversation.

Hey, Shankar.

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The fight was over a pair of gym shoes. One teenager faces years in prison. The other — the 15-year-old grandson of Congressman Danny Davis — is dead.

We often hear stories about murders sparked by trivial disputes. And we also hear the same solutions proposed year after year: harsher punishments, more gun control.

But what if science can help us find new solutions? Can understanding how we make decisions help us prevent these tragedies?

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Few topics send the media into a panic like the idea of hookup culture on college campuses. But are college students actually having more sex than their parents did a generation ago? Research suggests the answer is no.

Lisa Wade, a sociologist at Occidental College, says something has changed, though: In today's hookup culture, developing an emotional attachment to a casual sex partner is one of the biggest breaches of social norms.

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President Donald Trump's decision to temporarily ban immigrants from seven Muslim-majority countries and refugees from across the globe has set off a firestorm of protest. In airports and city streets across the U.S. and beyond, people turned out by the thousands over the weekend to protest the action.

Researchers have long been confused by what seems like a paradox: many people in America vote against their economic self-interests. Whether it's the working class conservative who wants a tax cut for the wealthy, or a member of the liberal elite who fights for safety nets that raise his own taxes — we don't always act in the way that would help us the most.

If you've ever visited the palm-lined neighborhoods of Beverly Hills, you've probably noticed that the rich and famous aren't the only ones drawn there.

Stargazers also flock to this exclusive enclave, seeking a chance to peer into — and fantasize about — the lives of movie stars and film directors.

Call it adulation, adoration, idolization: we humans are fascinated by glamour and power.

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Life often requires improvisation, especially when things don't go according to plan. NPR's social science correspondent Shankar Vedantam brings us the story of one woman who's had to reinvent herself again and again.

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So we know that a picture speaks a thousand words, but NPR's Shankar Vedantam is here to tell us how it also gives us really strong impressions of people that we can't seem to shake. Hi, Shankar.

SHANKAR VEDANTAM, BYLINE: Hi, Rachel.

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As the mayor of New York City, Rudy Giuliani was a proponent of a controversial policing philosophy known as "broken windows." It calls for police to go after small crimes, in hopes of preventing bigger problems.

At first, it appeared as if violent crime dropped in the neighborhoods where "broken windows" policing was in force. The statistics, however, told a different story.

But the idea remains popular, despite evidence it likely had only modest effects.

The election of Donald Trump came as a shock to many Americans, but perhaps most of all to those in the business of calling elections. The pollsters on both the left and the right had confidently predicted Hillary Clinton would walk away with the race. They got it wrong. But one man did not: Allan Lichtman.

On Sept. 23, Lichtman, a historian at American University, declared that Trump would win, and he stuck by that call through the tumultuous final weeks of the campaign.

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