These clam fossils give us a glimpse of what the Earth looked like 3 million years ago: | NOVA l PBS

Inside the Tunnel of Bones, scientists found evidence of an ancient cannibalistic massacre. | NOVA l PBS

Pi is all around you –– even in light and sound! | NOVA l PBS

Cats have famously mysterious facial expressions. But this scientist identified 48 facial coordinates to help figure out what they're feeling: | NOVA l PBS