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  • 250,000-year-old skull raises questions about human origins
  • Copper and drug combo may treat deadly brain tumors in kids
  • Comet’s intense heat turned sand to glass 12,000 years ago
  • Young people get less sex ed now than 25 years ago
  • COVID-19 had a surprising effect on 2020 US election
  • 2 things cause weak quads after ACL surgery