The surprising reason birds first grew feathers

When birds first grew feathers 150 million years ago, their function was not necessarily to help with flight. (2:31)

Latest Videos

Preview thumbnail for video'Footage of the 1980 Mount St. Helens eruption
Footage of the 1980 Mount St. Helens eruption (3:47)
Preview thumbnail for video'This pressure suit helped pilots survive new heights
This pressure suit helped pilots survive new heights (3:59)
Preview thumbnail for video'This New Zealand farmer revolutionized modern planes
This New Zealand farmer revolutionized modern planes (1:20)
Preview thumbnail for video'Why Jaguar uses aerospace aluminum to build its cars
Why Jaguar uses aerospace aluminum to build its cars (3:09)
Preview thumbnail for video'This inventor made the famed D-Day swimming tanks
This inventor made the famed D-Day swimming tanks (2:47)
Preview thumbnail for video'This pilot made an emergency landing a shallow river
This pilot made an emergency landing a shallow river (3:21)
Preview thumbnail for video'AirAsia Flight 8501 plummets into the Java Sea mid-flight
AirAsia Flight 8501 plummets into the Java Sea mid-flight (2:56)
Preview thumbnail for video'This Apollo 8 astronaut took the famous
This Apollo 8 astronaut took the famous "Earthrise" photograph (2:43)
Preview thumbnail for video'This sailor got sucked inside a jet engine.
This sailor got sucked inside a jet engine. (1:54)