Notebook

  1. Chemistry

    Astronauts may be able to make cement using their own pee

    Lunar dust and a compound found in urine could be used to build future dwellings on the moon, a new study finds.

    By Lisa Grossman
  2. Archaeology

    50 years ago, explorer Thor Heyerdahl’s Atlantic crossing hit a snag

    Explorer Thor Heyerdahl followed an aborted Atlantic voyage with a second trip that indicated ancient Egyptians could have traveled over long distances by sea.

    By Bruce Bower
  3. Ecosystems

    Tapirs may be key to reviving the Amazon. All they need to do is poop

    Brazilian ecologist Lucas Paolucci is collecting tapir dung to understand how the piglike mammals may help restore degraded rain forests.