Science

by Benjamin Snyder/Fortune

by Dan Kedmey

by TIME Photo

by Justin Worland

by Justin Worland

by Justin Worland

by Jeffrey Kluger

by John Kell / Fortune

by Daniel White

by Jonathan D. Woods and Jeffrey Kluger

by Alexandra Sifferlin

by Jonathan D. Woods

by Victor Luckerson

by Tanya Basu

by Nash Jenkins