In the time of COVID social-distancing, loneliness is all around us. Julianne Holt-Lunstad explains how isolation can make the pandemic worse, and how good relationships can protect our health.

The famed actress and activist says she’s learned a lot from getting arrested at her own climate rallies in D.C. last year. She fills us in on the need to address injustice while we fight global warming, how the COVID pandemic has changed her activism, and how individuals can step up when governments fail them.

Jacqueline Faherty from the American Museum of Natural History explains the mysteries of brown dwarfs — bigger than planets, smaller than stars — and reveals how she's improving STEM by making it more diverse.

What type of test should you get, and when? How much can you trust the results? And could rapid screening tests really help us reopen businesses and schools?

Eric Haseltine reveals how he used neuroscience to create best-selling toys and to protect U.S. troops from roadside explosives. He also shares some tips to help you (yes, you!) fix your suboptimal behaviors.

You'd never fall for a conspiracy theory, right? Yeah, keep telling yourself that. Psychologist Rob Brotherton explores the history of conspiracy theories — including a famous fake-news scare that was itself fake news — and explains why it's so hard to avoid them.

More than 99 percent of people who get COVID-19 recover. But many unknown chronic effects may await those people all the same.

It’s the most famous mass extinction of all time, but we’re only just starting to understand the impact that killed the (ancient) dinosaurs. Geophysicist Joanna Morgan takes us to the crater to imagine the day the asteroid hit and the nightmarish aftermath.

She’s famous for her science fiction movies (the “Star Wars” prequels, Thor, Annihilation), but hard science runs through Natalie Portman’s veins. We discuss her early research in chemistry and psychology, her environmental activism, and her strategies to keep her kids’ curiosity alive during the pandemic.

Arne Duncan — former Secretary of Education under President Obama — walks us through what needs to be done for schools to reopen safely in the fall.