When you're hungry, it can be hard to think of anything other than food. When you're desperately poor, you may constantly worry about making ends meet. When you're lonely, you might obsess about making friends. This week on Hidden Brain, we explore the psychological phenomenon of scarcity and how it can affect our ability to see the big picture and cope with problems in our lives.

There are some topics about which it seems no amount of data will change people's minds: things like climate change, or restrictions on gun ownership. Neuroscientist Tali Sharot says that's actually for good reason. As a general rule, she says, it's better to stick to your beliefs and disregard new information that contradicts them. But this also means it's very difficult to change false beliefs. This week, we look at how we process information, and why it's so hard to change our views.

Nearly a year ago, we ran an episode about one of the world's most intractable divides: the Israeli–Palestinian conflict. Since that story aired, a solution seems even more out of reach. We wanted to play this episode again, because it offers something we don't often hear in the news: empathy for the other side.

Making jokes about politics is a tradition as old as America itself. These days, of course, comedians have a new target: President Donald Trump. We talk with Iranian-American comedian Maz Jobrani about finding humor in the midst of deep political divides, and how he uses an understanding of human nature to craft a successful punchline.

What would drive someone to take another person's life? When researchers at the University of Chicago asked that question, the answer was a laundry list of slights: a stolen jacket, or a carelessly lobbed insult. It made them wonder whether crime rates could be driven down by teaching young men to pause, take a deep breath, and think before they act. We'll go inside a program that teaches Chicago teens to do just that, and explore the research on whether this approach actually works.

We all know casual sex isn't about love. But what if it's not even about lust? Sociologist Lisa Wade believes the pervasive hookup culture on campuses today is different from that faced by previous generations. This week on Hidden Brain, we explore what this culture means for those who choose to participate, and for those who opt out.

A recent paper found that black patients receive less pain medication for broken bones and cancer. Black children receive less pain medication than white children for appendicitis. The research is new, but the phenomenon is not. This week, we revisit an episode from our archive that looked at the intersection of race, pain, and medicine. It might not be suitable for young children.

Barely a week after assuming office, President Donald Trump set off a worldwide firestorm when he decided to temporarily ban entry to migrants from seven Muslim-majority countries and refugees from all over the world. In response, many people are looking to the past, to see what history can teach us. But this process can fraught with psychological peril. On today's Hidden Brain, we revisit a specific incident from World War II – the American decision to refuse entry to Jewish refugees aboard the SS St. Louis – and explore how it speaks to the current mood in the United States.

In the months since the presidential election, many have noted that lots of Americans live in bubbles — echo chambers filled with the voices of people who mostly agree with us. Sociologist Arlie Hochschild felt this long before the rise of Donald Trump, and five years ago she went on a mission to understand the other side. She left her own liberal bubble in Berkeley, California for a conservative one, deep in the Louisiana bayou.

It's inauguration season, which means balls, parades, and celebrations. We may love the pomp and circumstance, but there's another, darker side to our psychology, too. Whether we like the new president or not, human beings have a strange and contradictory relationship with power and celebrity. We idolize the rich and famous, but also enjoy seeing them fall from their pedestals. This week on Hidden Brain, we explore this paradox: from Hollywood, to the White House, to the forests of Tanzania.