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  1. Animals

    Scientists found modern domestic horses’ homeland in southwestern Russia

    Two genes tied to endurance and docility may help explain the horses’ success in spreading across Eurasia.

    By Jonathan Lambert
  2. Physics

    Here’s the physics of why ducklings swim in a row behind their mother

    By paddling in just the right spots, ducklings save energy by surfing their mom’s waves, and pass along the benefit to siblings down the line.

    By Emily Conover
  3. Health & Medicine

    Here’s what we know about booster shots for Moderna’s and J&J’s COVID-19 vaccines

    Immunity against the coronavirus is waning, but additional doses of the same or different COVID-19 vaccines could help protect vulnerable people.