Scientific research

Supernovas Could Have Forced Early Humans to Walk Upright

Ancient star explosions, known as supernovas, might have led early humans to walk upright as wildfires destroyed lush arboreal habitats and forced them out onto grasslands where two-legged living made more sense, a new theory suggests. “If you’re still using trees a lot, you now have to walk from one to the other — you can’t swing around up there like an orangutan,” said Adrian Melott, a physicist at the University of Kansas in Lawrence and lead author of a paper about the research published in the Journal of Geology.