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  1. Physics

    A static electricity mystery comes to the surface

    Seemingly random charging of identical materials depends on the carbonaceous molecules stuck to their surfaces

    By Emily Conover
  2. Earth

    To make a ‘Snowball Earth,’ sci-fi moves fast. Geology is far slower

    The Day After Tomorrow, Snowpiercer, Snowball Earth: Such end-of-days visions of a frozen Earth are fantastical … but can contain a snowflake of truth.

    By Carolyn Gramling
  3. Animals

    Sharks are ingesting drugs in the Bahamas

    Nearly one third of sharks studied near the Bahamas’ Eleuthera Island were found to have caffeine, painkillers and other drugs in their bloodstreams.

    By Joshua Rapp Learn
  4. Animals

    Platypus fur has a surprising feature seen only in bird feathers

    Platypuses are the first mammals known to have hollow melanosomes, pigment-bearing structures found in the hair of many animals.