Signs carved into a stone slab may represent the earliest known writing in the Americas.
Tiny fossils show that rainforests existed in the western Amazon millions of years ago.
Observations of a tremendous galactic crash point to invisible stuff called dark matter.
Astronomers have spotted an odd pair of banana-shaped features in a planet-forming cloud around a nearby star.
Researchers have rediscovered and studied a millipede with as many as 750 legs.