U.S.

by Abigail Abrams

by Cady Lang

by Tara Law

by Bill Gates

by Sanya Mansoor

by P.W. Singer and Michael McConnell

by Megan McCluskey and Peter Allen Clark

by Belinda Luscombe

by Jasmine Aguilera

by Ian Bremmer

by Abigail Abrams

by Brian Bennett

by Jeffrey Kluger

by D.W. Pine

by Roya Hakakian