Hidden under Paris is a rich source of limestone, a vast labyrinth of quarry tunnels.
Solar geoengineering is like drawing a curtain over the face of the Earth.
This researcher shoots lasers at trees in order to measure how much carbon forests store.
By studying asteroids, researchers can learn about the formation of planets.
Gorongosa National Park was once one of the most species-rich places in Africa.
Watch how a printing press works.
Learn why Egyptian hieroglyphs are hiding in modern alphabets—and how to find them.
Can a slime mold find food placed at the far end of a labyrinth?