Was North America populated by 'stepping stone' migration across Bering Sea?
Global glacier retreat has accelerated
Mammals evolved big brains after big disasters
Icy clouds could have kept early Mars warm enough for rivers and lakes
A new perspective on the genomes of archaic humans
Genetic effects of Chernobyl radiation
Mars has right ingredients for present-day microbial life beneath its surface, study finds
Experimental drug shows potential against Alzheimer's disease
Among COVID-19 survivors, an increased risk of death, serious illness
Astronomers release new all-sky map of Milky Way's outer reaches