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  1. Earth

    Ozone Depletion and Recovery

    Answers to questions about ozone depletion and the recovery of the ozone hole are now easy to find by researchers, as well as the general public, through a new online index developed by NOAA’s Earth System Research Laboratory. The site uses simple graphs and charts to track progress in reducing the threat to Earth’s ozone […]

    By Science News
  2. Math

    The Complexity of TipOver and Other Puzzles

    Solving puzzles such as TipOver and River Crossing can be surprisingly difficult.

    By Ivars Peterson
  3. Animals

    Perils of Migration: New evidence that bats stalk birds

    Big Mediterranean bats snatch migrating songbirds out of the night sky in spring and fall.