Rhaina Cohen

Rhaina is a production assistant for Hidden Brain. She got her start in public radio as an intern for Planet Money. Before entering the audio world, Rhaina worked in television news and on book projects. She was part of the production team for the ABC News show, This Week with George Stephanopoulos. She worked as a research assistant for Rebecca Traister on the New York Times bestselling book, All The Single Ladies: Unmarried Women and the Rise of an Independent Nation and for Peter Slevin on his biography of the former first lady, Michelle Obama: A Life.

As a Marshall Scholar, Rhaina received a master's in Comparative Social Policy from Oxford (and while there, competed in a dance style that hasn't yet gained ground in the U.S., Acrobatic Rock 'n Roll). She holds a bachelor's degree in American Studies from Northwestern University. Through her undergraduate and graduate research, Rhaina studied family policies in Denmark, Iceland and the U.S. military.

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Companies buy back their stock from shareholders when they have excess cash lying around, and they want to hand some of it over to the owners. And they've been doing it a lot more recently: companies are on track to spend more than a trillion dollars on buybacks this year. Today on the Indicator, dueling opinions on buybacks. One economist says they're a way to get cash to companies that need it; another argues they're a brake on the economy.

Music: "Break Me"

In a way, all of us are time travelers. If we just pause and close our eyes we can wander back to our first kiss...our first breakup...that grandparent we should have visited...the summer that went on forever. This week, we explore two emotions that pull us into the past: regret and nostalgia. How can we make these feelings work for us, and what can we learn from them?

When Paul Kugelman was a kid, he had no shortage of friends. But as he grew older and entered middle age, his social world narrowed.

"It was a very lonely time. I did go to work and I did have interactions at work, and I cherished those," he says. "But you know, at the end of the day it was just me."

Kugelman's story isn't unusual: researchers say it can be difficult for men to hold on to friendships as they age. And the problem may begin in adolescence.

Women in the Middle Ages were excluded from many realms: the law,

We take it for granted that nostalgia is an ordinary, harmless emotion. You won't get a referral for a psychologist because you've posted a childhood photo with the caption #ThrowbackThursday, or because you have a weak spot for Lucky Charms or Fruit Roll-Ups. But that's a relatively new way of thinking.

The scientist who coined the term "nostalgia" in 1688 thought of this emotion as a neurological illness caused by demons. Other scientists latched onto this conception of nostalgia as a disease. It took marketers, centuries later, to realize that nostalgia has benefits.

Olutosin Oduwole was in his dorm room at Southern Illinois University when police knocked on his door one day in 2007. They were there to arrest him.

"In my mind I'm thinking, 'Okay, maybe a warrant for a ticket.' I really didn't know what was going on," he says.

What was going on was that the police suspected that Olutosin, a college student and aspiring rapper, was on the brink of committing a Virginia Tech-style mass shooting on his campus. He was soon charged with attempting to make a terrorist threat, and was eventually convicted and sent to prison.