Uncategorized

  1. Animals

    Why do sea turtles, penguins and sharks sometimes just swim in circles or spirals?

    Tracking devices recorded the loops and spirals of 10 marine species. In some cases, scientists have good guesses for why; other times it’s baffling.

    By Susan Milius
  2. Health & Medicine

    Here’s what makes 4 promising COVID-19 vaccines unique — and potentially useful

    More vaccines still in the works are exploring a variety of approaches, including pills and electrical zaps.

    By Tina Hesman Saey
  3. Health & Medicine

    AstraZeneca says its COVID-19 vaccine is 79 percent effective in a U.S. trial

    The shot was 80 percent effective at preventing illness in people 65 and older and prevented severe disease and hospitalization.