Exploding stars may have motivated human ancestors to walk - CNN

1. Exploding stars may have motivated human ancestors to walk  CNN
2. Ancient Supernovae Prompted Human Ancestors to Walk Upright  SciTechDaily
3. Walking Upright: Evolution of Bipedalism Linked to Supernova in New Theory  Inverse
4. Did ancient supernovae prompt human ancestors to walk upright?  Science Daily
5. Supernovae Bombardments Likely Spurred Proto-Humans To Walk On Two Legs  Forbes
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