Notebook

  1. Archaeology

    50 years ago, Stonehenge’s purpose mystified scientists. It still does

    In 1972, scientists thought Stonehenge may have been a calendar. Today, we still don’t know its purpose, but we have gained insight on its origin.

    By Maria Temming
  2. Earth

    50 years ago, scientists found a new way to clean up oil spills

    In the 1970s, researchers added chemicals to the list of oil spill cleanup methods. Soon, they may add microbes.

    By Meghan Rosen
  3. Earth

    50 years ago, scientists dug into Pangaea’s past lives

    In 1972, scientists wondered whether Pangaea was Earth’s only supercontinent. Fifty years later, we know it wasn’t the first and it won’t be the last.