Soil scientist Asmeret Asefaw Berhe could soon hold one of the most important jobs in science. She explains why the ground beneath our feet is one of our greatest resources — and, possibly, one of our deadliest threats.

How psychologist Dan Gilbert went from high school dropout to Harvard professor, found the secret of joy, and inspired Steve Levitt's divorce.

Linguist and social commentator John McWhorter explains how good intentions may be hurting Black America — and where the word “motherf*cker” comes from.

Beatrice Fihn wants to rid the world of nuclear weapons. As Russian aggression raises the prospect of global conflict, can she put disarmament on the world's agenda?

Nobel Prize winner Joshua Angrist explains how the draft lottery, the Talmud, and West Point let economists ask — and answer — tough questions.

Palliative physician B.J. Miller asks: Is there a better way to think about dying? And can death be beautiful? 

Naturalist Sy Montgomery explains how she learned to be social from a pig, discovered octopuses have souls, and came to love a killer that will never love her back. 

Gene-editing pioneer Jennifer Doudna worries that humanity might not be ready for the technology she helped develop. 

Columbia astrophysicist David Helfand is an academic who does things his own way — from turning down job security to helping found a radically unconventional university. 

Stanford professor Carolyn Bertozzi’s imaginative ideas for treating disease have led to ten start-ups. She talks with Steve about the next generation of immune therapy she’s created, and why she might rather be a musician.