Extras
What studying the surface of the Moon revealed about Earth’s apocalyptic youth.
Do speech buttons really allow dogs to talk to us? Scientists investigate.
New evidence sheds light on the remarkable life—and mysterious collapse—of the ancient jungle city.
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.