Ever wonder how the heart symbol came to stand for the actual heart? And why do we speak of the heart as the seat of love, when love really happens in our brains? Is it true that animals only get a billion heartbeats? This week, we give you enough cool cardiac science to make your heart skip a beat.
Why do we sleep? We spend a third of our lives in slumber, but science has yet to determine exactly why we have do it. Here’s a look at how sleep works, why we’re not getting enough sleep, what happens if you DON’T sleep, and an idea about where sleep came from in the first place.
2015 • Health
This episode discusses the human exploration of Antarctica, in particular the mission led by Captain Robert Falcon Scott, whose team died on the way back from the South Pole. It shows the scientific work in the modern human bases in Antarctica, especially Mawson Base and its observation of Adelie Penguins (partially through tracking devices).
Snakes have developed the ultimate economy of design and are the most elegant and iconic of hunters. Among the incredible species seen here are blind tiger snakes that hunt using their sense of smell, magnificent African spitting cobras and a bizarre turtle-headed sea-snake hunting on a coral reef. And, for the first time ever, cameras capture a snake ambush in the wild and the beautiful spectacle of yellow anacondas giving birth underwater.
Planet Earth was inhabited by many wondrous creatures throughout the Permian period. Massive geologic changes finally allowed life to thrive on land and sea, producing voracious saber-toothed carnivores like Gorgonopsid and the terrifying 40-foot shark Helicoprion. But it couldn't last forever...