Science

by Barbara Tasch

by Denver Nicks

by TIME Staff

by Katherine Harmon Courage

by Barbara Tasch

by Michael D. Lemonick

by Bijan Stephen

by Bijan Stephen

by Nolan Feeney

by Bryan Walsh

by Sam Frizell

by Michael D. Lemonick

by Jeffrey Kluger

by Noah Rayman

by Denver Nicks