Extras
What if violent asteroid impacts actually jump-started life on Earth? Explore a dramatic theory.
Adam Riess takes us inside the discovery of dark energy.
Early humans may have brought offerings to this enormous stone snake.
In a remote cave, in North West Africa, a chance discovery uncovered some mysterious human remains.
These monkey bones showed that early humans could thrive in the rainforest.
Ancient bones reveal that early Homo sapiens and Neanderthals didn’t just coexist.
Inside the Tunnel of Bones, a macabre Neanderthal mystery unfolds.
This form of bear hunting took nerves of steel.
A small piece of insulation caused catastrophic damage.
It became the basis for most written languages, beginning 4,000 years ago in the Sinai desert.