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  1. 19668

    Clock time has long been out of step with the heavens. Since the adoption of time zones in the 19th century, we have accepted disparities of as much as 30 minutes at the edges of the time zones (more in some cases since time zones are set by politics, not geography). And of course, the […]

    By Science News
  2. Humans

    To Leap or Not to Leap

    Scientists are debating whether to continue the practice of occasionally inserting leap seconds in order to keep official, atomic-based time in sync with time based on Earth's rotation.

    By Ron Cowen
  3. Humans

    From the April 11, 1936, issue

    Spring flowers, alcohol's effect on the liver, and tapping into brain waves.