Learn  about ongoing space biology research.

Join Neil deGrasse Tyson and Dr. Daryl Hoffman, a cardiac surgeon from Beth Israel Medical Center in NYC, as they discuss the ins and outs of the physical capacities the human heart has.

Pediatric cardiologist Dr. Jane Crosson from Johns Hopkins Hospital answers questions about the heart.

In this special episode, Alie sits down with Scotsman and hematologist Dr. Brian Durie to talk about blood: what it is, and what can go wrong.