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

The Big Bang wasn't an explosion. Here's what it actually was: | NOVA l PBS

Research –– and this performing cat troupe –– suggests that cats can be trained if they know what's in it for them. | NOVA l PBS

Archeologists found bones while researching a 500-year-old shipwreck. Who – or what – could they have belonged to? | NOVA l PBS