The Arctic’s frozen waters have entered a radically new state.
A new study identifies a likely ancestor to all placental mammals.
Human ancestry informs the study of modern diseases.
Bones reveal that ancient human relatives were part-time tree dwellers.
How a deep-drilling experiment is fighting climate change.
A river valley found on a distant moon resembles Earth’s Nile.
A short-nosed bat bests its nectar-drinking cousin at pollination.
A web program creates disease maps to track epidemics.
A giant hole in the dust disk around a star could hold multiple planets.
DNA evidence identifies the world’s rarest whale.