News

Physics

Negative mass might not defy Einstein

Repulsive matter could have played a role in the early universe, a computational study finds.

Chemistry

Radioactive fuel turns to goo during nuclear meltdown

Experiments reveal the atomic rearrangements that occur within uranium dioxide when nuclear reactors fail.

Archaeology

Barley elevated Central Asian farmers to ‘the roof of the world’

Hardy western crops allowed villagers to settle in the cold, thin air atop the Tibetan Plateau.

Neuroscience

Breathing returns to paralyzed rats

Scar tissue–busting enzyme plus rehabilitation therapy improves respiration long after rats’ initial spinal cord injuries.