|Kenyan fossil finds show that many human species once coexisted.|
Paying attention stimulates brain cells that improve memory.
Urban coyotes in the Midwest choose lifelong partners.
Tracking light from the early Universe.
Tiny goblin spiders play a big part in the study of biodiversity.
Paths left by receding glaciers help scientists understand climate change.
An ancient fossil helps explain the origin of flexible skulls in infants.