Astronaut Don Pettit Celebrates his 70th Birthday By Returning to Earth's Crushing Gravity

How activity in Earth's mantle led the ancient ancestors of elephants, giraffes, and humans into Asia and Africa

How activity in Earth’s mantle led the ancient ancestors of elephants, giraffes, and humans into Asia and Africa - EurekAlert!

Earth’s landmasses lost trillions of tons of water this century