Who was the mystery man buried underneath Notre Dame? Watch scientists examine his remains in an attempt to find out: | 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

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

Göbekli Tepe may be the oldest temple ever discovered, carved by hunter-gatherers 6,000 years before Stonehenge. | NOVA l PBS