Investigate

The Rise and Fall of Tiangong-1, China’s First Space Station

Hanging Out the Wash in the Fresh, Clean Air

A Few Species of Frogs That Vanished May Be on the Rebound

Why Do Cracking Knuckles Make That Sound? You Might Need a Calculator

Chile and Its Scientists Protest Research on Tiny Mummy

Drones Spy Caribou on a Treacherous, Icy Crossing

Earliest Known Human Footprints in North America Found on Canadian Island

Arctic Foxes on a Swedish Mountain Turned ‘Blue.’ It Was a Good Thing.

How to Spot a Nuclear Bomb Program? Look for Ghostly Particles

NASA’s Webb Telescope Faces More Setbacks

China’s Space Station May Crash to Earth on April Fool’s Day

Insects Flew Before Anything Else Did. So How Did They Get Their Wings?

Meet Tess, Seeker of Alien Worlds