Uncategorized

  1. Astronomy

    Dark Influence

    A study of galaxy clusters tests whether dark matter particles can collide with each other, while other observations show that dark matter doesn't behave as expected near the centers of galaxies.

    By David Shiga
  2. Math

    Captcha the Puzzle

    A computer creates a test that it can't pass but most people can.

    By Ivars Peterson
  3. Humans

    From the April 13, 1935, issue

    A giant meteorite discovered in Kansas, gasoline made from coal in Germany, and elastic rock layers deep in the earth.

    By Science News
  4. Math

    Paper Enigma

    The enigma machine was used by Germany during World War II to encrypt and decrypt messages.