Science

by Rachel Janik

by Justin Worland

by Justin Worland

by Justin Worland

by TIME Staff

by NBC News

by Sarah Begley

by Jeffrey Kluger

by Jeffrey Kluger

by Tessa Berenson Rogers

by Helen Regan

by Nolan Feeney

by Rishi Iyengar

by Jack Linshi

by Markham Heid