EarthThe worst mass extinction may have begun with mass sterilisation There seems to have been a surge in ultraviolet radiation during the Permian extinction 252 million years ago, and it might have left plants infertile rather than kill them News
LifeYoung 'dinosauromorphs' may have begged for food like baby birds Tens of millions of years before dinosaurs evolved into birds, a proto-dinosaur had surprising features that suggest its young needed parental care after hatching News