Around 6 million years ago, a massive supernova may have sent a wave of cosmic radiation crashing into Earth. At first glance, this distant event in the cosmos might seem irrelevant to life on our ...

Looking again through the magnifying lens at the fossil's surface, one of us, Sabrina Curran, took a deep breath. Illuminated ...

The Laetoli footprints are rare treasures in the record of human ancestry ... can be considered a fossil.) 3.6 million years ago, a volcano now called Sadiman puffed out a cloud of ash that ...