Sometimes, life can feel like being stuck on a treadmill. No matter how hard you try to get happier, you end up back where you started. What's going on here? We kick off our annual You 2.0 summer series with happiness researcher Elizabeth Dunn, who explains how to fight the treadmill feeling.

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. Researchers have found that people with deep connections to those from other countries and cultures often see benefits in terms of their creative output. This week, we revisit a favorite 2018 episode about 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.

In 2019, a novel by a new author, Gail Shepherd, arrived in bookstores. The True History of Lyndie B. Hawkins tells the story of a young white girl growing up in the South. The book has been well received, but it is not the book Shepherd intended to write. In her original drafts, Shepherd, a white author, created a Lyndie who was Vietnamese-American, and dealing with issues of race in the deep South. This week we look at what it means to be a storyteller in a time of caustic cultural debate and ask when, if ever, is it okay to tell a story that is not your own?

How do you change someone's behavior? Most of us would point to education or persuasion. But what if the answer lies elsewhere? This week, we revisit a 2018 story about human nature and behavior change — a story that will take us on a journey from Budapest to the hills of Rwanda.

Not long after his sixteenth birthday, Fred Clay was arrested for the murder of a cab driver in Boston. Eventually, Fred was found guilty — but only after police and prosecutors used questionable psychological techniques to single him out as the killer. This week on Hidden Brain, we go back four decades to uncover the harm that arises when flawed ideas from psychology are used to determine that a teenager should spend the rest of his life behind bars.

"We hold these truths to be self-evident, that all men are created equal." These words, penned by Thomas Jefferson more than 240 years ago, continue to inspire many Americans. And yet they were written by a man who owned hundreds of slaves, and fathered six children by an enslaved woman. As we mark Independence Day this week, we return to a 2018 episode with Pulitzer Prize-winning historian Annette Gordon-Reed. We explore the contradictions in Jefferson's life — and how those contradictions might resonate in our own lives.

Policymakers have a tried-and-true game plan for jump-starting the economy in times of severe recession: Push stimulus packages and lower interest rates so Americans will borrow and spend. But economist Amir Sufi says the way we traditionally address a recession is deeply flawed. He argues that by encouraging "sugar-rush" solutions, the nation is putting poor and middle-class Americans and the entire economy at even greater risk. This week we look at the role of debt as a hidden driver of recessions, and how we might create a more stable system.

In the past few weeks, the nation has been gripped by protests against police brutality toward black and brown Americans. The enormous number of demonstrators may be new, but the biases they're protesting are not. In 2017, we looked at research on an alleged form of bias in the justice system. This week, we revisit that story, and explore how public perceptions of rap music may have played a role in the prosecution of a man named Olutosin Oduwole.

President Trump said this week that a few "bad apples" were to blame for police killings of black people. But research suggests that something more complicated is at play — a force that affects everyone in the culture, not just police officers. In this bonus episode, we revisit our 2017 look at implicit bias and how a culture of racism can infect us all.

If we do a favor for someone we know, we think we've done a good deed. What we don't tend to ask is: Who have we harmed by treating this person with more kindness than we show toward others? This week, in the second of our two-part series on moral decision-making, we consider how actions that come from a place of love can lead to a more unjust world.