Ancient Footprints Push Back Date of Human Arrival in the Americas

Those earrings are so last year – but the reason you're wearing them is ancient

Astronomers analyzing 3D maps of the shapes and sizes of nearby molecular clouds have discovered a gigantic cavity in space. The sphere-shaped void pans about 150 parsecs—nearly 500 light years. Researchers believe the cavity was formed by ancient supernovae that went off some 10 million years ago.

Modern Activities Follow the Contours of Ancient Teotihuacan City