Placebos belong in clinical trials, not in the doctor's office. That's the conventional wisdom, anyway. This week, we ask what placebos might teach us about healing.

If you've ever flown in economy class on a plane, you probably had to walk through the first class cabin to get to your seat. Maybe you noticed the extra leg room. The freshly-poured champagne. Maybe you were annoyed, or envious. Social psychologist Keith Payne says we tend to compare ourselves with those who have more than us, but rarely with those who have less. This week, we explore the psychology of income inequality, and how perceptions of our own wealth shape our lives.

The desire to find our tribe is universal. We like to know who we are and where we belong. This fascination has led to a thriving industry built on the marketing and sale of personality tests. These tests offer individuals – and, increasingly, employers – quick and easy insights that can be used to make some of life's biggest decisions. But most fail to stand up to scientific scrutiny. This week, we revisit our 2017 episode about the world of personality testing, and explore the many different ways we assess personality and potential – from the Chinese zodiac to Harry Potter houses to the Myers-Briggs test.

Chaos is a part of all of our lives. Sometimes we try to control it. And other times, we just have to live with it. On this week's Hidden Brain, we bring you two of our favorite stories about coping with chaos. They come from our 2016 episodes "Panic in the Streets" and "Embrace the Chaos."

All social classes have unspoken rules. From A-list celebrities to teachers, doctors, lawyers, and journalists — there are social norms that govern us, whether we realize it or not. This week on Hidden Brain, we look celebrity culture, as well as another elite group: the yoga-loving, Whole Foods-shopping, highly-educated people whom one researcher calls the new "aspirational class." This episode is from December 2017.

From stone statues to silicone works of art, we have long sought solace and sex from inanimate objects. Time and technology have perfected the artificial lover: today we have life-size silicone love dolls so finely crafted they feel like works of art. Now, with the help of robotics and artificial intelligence, these dolls are becoming even more like humans. This week we talk with researcher Kate Devlin about the history of the artificial lover, and consider what love and sex look like in the age of robots.

You own your body. So should you be able to sell parts of it? This week, we explore the concept of "repugnant transactions" with the man who coined the term, Nobel Prize- winning economist Al Roth. He says repugnant transactions can range from selling organs to poorly-planned gift exchanges — and what's repugnant in one place and time is often not repugnant in another.

Annie Duke was about to win $2 million. It was 2004, and she was at the final hand of the World Series of Poker Tournament of Champions. But as a woman at a table full of men, she wasn't sure she deserved to be there. In this week's Radio Replay, we tell the stories of two people who grappled with gender stereotypes on the job. Annie Duke shares her experiencing at the World Series of Poker, and then we hear the story of Robert Vaughan, a former Navy sailor who decided to pursue a new career as a nurse.

Our modern world is saturated with awards. From elementary school classrooms to Hollywood to the hallways of academia, there's no shortage of prizes. But — do they work?

The eugenicists were utopians, convinced that they were doing hard but necessary things. And that included making decisions about who could have children.

Today, more and more of us are living through the people on our screens and in our headphones. It's not real, but for many of us, it's close enough.

What happens when we connect with people whose view of the world is very different from our own? We look at the links between diversity, conflict, and creativity.

All of us think back to turning points in our lives, and imagine how things could have unfolded differently. Why do we so often ask ourselves, "What if?"

We like to think that science evolves in a way that is...rational. But this isn't always the case. This week, we look at how information and misinformation spread in science.

This week, a scientific look at what makes us laugh. Here's a hint — a lot of it isn't funny. We talk to neuroscientist (and stand up comedian) Sophie Scott.

In 2009, an old man died in a California nursing home. His obituary included not just his given name, but a long list of the pseudonyms he'd been known to use. In this episode, we trace the life of Riley Shepard, a hillbilly musician, writer, small-time con man and, perhaps, a genius.

This week, we look at the science of compassion, and why doing good things for others can make a big difference in your own life.

We dig into the psychology that determines the foods that make us salivate and the scents that make us squirm.

Arguments and bickering can sour family gatherings during the holiday season. This week, we share tips on how to avoid miscommunication from our January 2018 conversation with actor Alan Alda. You might know him from his roles on television shows like MAS*H, The West Wing and 30 Rock, but in recent years Alda has also focused on helping scientists, and the rest of us, communicate better. His book is If I Understood You, Would I Have This Look on My Face? My Adventures in the Art and Science of Relating and Communicating.

When a newspaper shuts down, there are obvious costs to the community it serves: job losses, fewer local stories. But new research suggests there's another consequence that's harder to spot—one that comes with a hefty price tag for residents. This week on Hidden Brain we ask, who bears the cost when nobody wants to pay? For more information about the research in this episode, visit https://n.pr/2zSPraS.

Why do we always fall for surprise endings? It turns out that our capacity to be easily fooled in books and movies is made possible by a handful of predictable mental shortcuts. We talk this week with Vera Tobin, one of the world's first cognitive scientists to study plot twists. She says storytellers have been exploiting narrative twists and turns for millennia — and that studying these sleights of hand can give us a better understanding of the contours of the mind.

We try to translate the mysterious language of babies. And we ask, when should we step back and just let our children be?

Gender is one of the first things we notice about the people around us. But where do our ideas about gender come from? Can gender differences be explained by genes and chromosomes, or are they the result of upbringing, culture and the environment? In this encore episode from October 2017, we delve into debates over nature vs. nurture, and meet the first person in the United States to officially reject the labels of both male and female, and be recognized as "non-binary."

We're used to the idea that rhetoric sways voters. But what about another element of language: a candidate's voice? This week on Hidden Brain, what happens when our political system and ancient biological rules meet. For more information about the research in this episode, visit https://n.pr/2Pe1Fog.

Have you ever noticed that when something important is missing in your life, your brain can only seem to focus on that missing thing? On this week's Radio Replay, we bring you a March 2017 story about the phenomenon of scarcity, and how it can blind us to the big picture. Then, we go to the opposite end of the spectrum to look at the perils of excess. We'll bring you an October 2016 conversation with Brooke Harrington, a sociologist who wanted to know what it's like to be one of the richest people on the planet. For more on these topics, visit us at https://n.pr/2O8DkdV.

"Be the change you wish to see in the world." It's a popular quote that's made its way onto coffee mugs and bumper stickers — but it's not the easiest principle to live. On this week's Hidden Brain, we meet Royce and Jessica James, a couple who decided to raise their daughter in a gender-neutral way. It was far harder than they ever could have imagined. For further reading on children and gender norms, visit us at https://n.pr/2AmmiW1.

There is one truth that has endured through the first two years of Donald Trump's presidency: he has kept the support of the core voters who propelled him to the White House. This week on Hidden Brain, we explore two competing perspectives on the motivations of Trump supporters, and what they can tell us about the state of our union.

We often assume our life experiences are the root of our political ideologies. But what if there is something deeper at play?

You've certainly heard some variation of the phrase "be a man." But what does that even mean? On this episode of Hidden Brain, we discuss masculinity.

Nearly a quarter century ago, a group of women accused a prominent playwright of sexual misconduct. For the most part, the allegations went nowhere. In 2017, in the midst of the #MeToo movement, more women came forward to accuse the same playwright of misconduct. This time, everyone listened. On this episode — originally broadcast in February 2018 — we explore the story through the lens of social science research and ask, "Why Now?" What has changed in our minds and in our culture so that allegations of sexual harassment and assault are being taken more seriously than they were in the past? A note: This story includes descriptions of sexual harassment and assault. It may not be suitable for all listeners.

When Randy Gardner was 17, he won a world record for going eleven days without sleeping. On this Radio Replay, Randy shares insights from that experience and warns others against copying his stunt. Later in the program, we speak with neuroscientist Matthew Walker about the mind and body benefits of eight full hours of sleep.

After a disaster happens, we want to know whether something could have been done to avoid it. Did anyone see this coming? Many times, the answer is yes. So why didn't the warnings lead to action? This week, we explore the psychology of warnings with a visit to a smelly Alaskan tunnel, a gory (and fictional) murder plot, and even some ABBA.

If you live in a big city, you may have noticed new buildings popping up — a high-rise here, a skyscraper there. The concrete jungles that we've built over the past century have allowed millions of us to live in close proximity, and modern economies to flourish. But what have we given up by moving away from the forest environments in which humans first evolved? This week, we discuss this topic with psychologist Ming Kuo, who has studied the effects of nature for more than 30 years.

Have you ever had a job where you had to stop and ask yourself: what am I doing here? If I quit tomorrow, would anyone even notice? This week on Hidden Brain, we talk with anthropologist David Graeber about the rise of what he calls "bullshit jobs," and how these positions affect the people who hold them.

The simple "to-do" list may be one of humanity's oldest tools for getting organized. But checklists are also proving essential in many modern-day workplaces, from operating rooms to the cockpits of jumbo jets. As part of our summer You 2.0 series, we explore the power of the humble checklist to help us stay on track and focus on what's important, particularly when pressure is intense and the stakes are high.

What does it mean to be an original? As part of our summer series, You 2.0, we talk with psychology professor Adam Grant about innovators and the challenges they face. Adam gives his take on what makes an original, how parents can nurture originality in their children, and the potential downsides of non-conformity.

Ignorance is bliss, but knowledge is power...right? As part of our summer series, You 2.0, we try to understand why we stick our heads in the sand.

Finding a new job may be the solution to your woes at work. But there may also be other ways to get more out of your daily grind. This week, we talk with psychologist Amy Wrzesniewski of Yale University about how we can find meaning and purpose in our jobs.

If you're bilingual or multilingual, you may have noticed that different languages make you stretch in different ways. In this month's Radio Replay, we ask whether the structure of the languages we speak can change the way we see the world. We'll also look at how languages evolve, and why we're sometimes resistant to those changes.

Look down at what you're wearing. You picked out that blue shirt, right? And those sandals — you decided on those because they're comfortable, didn't you? Well, maybe not. Researcher Jonah Berger says we tend to be pretty good at recognizing how influences like product placement and peer pressure affect other people's choices...but we're not so good at recognizing those forces in our own decisions. We talked with him in December 2016.

There is great comfort in the familiar. It's one reason humans often flock to other people who share the same interests, laugh at the same jokes, hold the same political views. But familiar ground may not be the best place to cultivate creativity. From science and business to music and the world of fashion, researchers have found that people with deep connections to people from other countries and cultures often see benefits in terms of their creative output. This week on Hidden Brain, we look at the powerful connection between the ideas we dream up and the people who surround us, and what it really takes to think outside the box.

Fake news may seem new, but in reality, it's as old as American journalism. This week, we look at a tension at the heart of news coverage: Should reporters think of the audience as consumers, or as citizens? Should the media give people what they want, or what they need?

Why are we so often pulled into memories of the past? This week, two emotions we just can't shake: regret and nostalgia.

As many as 40 percent of students who intend to go to college don't actually show up to their new campuses in the fall. Education researchers call this phenomenon "summer melt," and it has long been a puzzling problem. These kids have taken the SATs, written college essays, applied to and been accepted by a school of their choice. Often they've applied for and received financial aid. So why would they not show up at college? This week, we bring you a 2017 episode looking more closely about the problem — and one way to address it.

There can be a lot of psychological noise involved in teaching. But what if we replaced all that mental chit chat....with a click? This week, we explore an innovative idea about how we learn. It will take us from a dolphin exhibit in Hawaii to a top teaching hospital in New York. It's about a method to quiet the noise. The sort of clutter that can turn learning into a minefield of misery.

Many parents think they can shape their child into a particular kind of adult. Psychologist Alison Gopnik says the science suggests otherwise. This week, we revisit our December 2017 conversation with Gopnik, who thinks we'd all be better off if we had a different understanding of the relationship between parents and kids.

How many ads have you encountered today? On this week's radio replay, we discuss the insidiousness of advertising in American media. We begin with new reporting about the effects cereal commercials have on children. Later in the program, we revisit one of our favorite episodes of 2018, Buying Attention.

Olutosin Oduwole was an aspiring rapper and college student when he was arrested in 2007. He was charged with "attempting to make a terrorist threat." Prosecutors used his writings — which he maintains were rap lyrics — to build their case against him. The week, we revisit our June 2017 story about Oduwole, and explore how public perceptions of rap music may have played a role in his prosecution.