Science

The Call-In: DNA Testing

NPR's Lulu Garcia-Navarro asks listener Maria Colon what about DNA testing kits interests her and then turns to The Gene author Dr. Siddhartha Mukherjee for more information.

Encore: Blue Light And Sleep

Lots of phone and tablet apps promise to improve sleep by filtering the blue light from device screens. But that won't help if you're not getting enough shuteye because of caffeine or stress.