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  1. Math

    Whips and Dinosaur Tails

    The loud crack of a deftly flicked bullwhip can certainly command attention. That distinctive noise is a small sonic boom, generated when the whip’s thin, highly flexible tip exceeds the speed of sound. Swinging a leather bullwhip’s thick, rigid handle in an arc gives the whip angular momentum. Sharply reversing the motion’s direction sends a […]

    By Ivars Peterson

  2. Alcohol can induce fainting spells

    Alcohol imbibed in modest quantities can disrupt the reflex that maintains blood pressure when a person stands up quickly, which may account for why some people faint when they down a few drinks and then stand up.

    By Nathan Seppa

  3. 19117

    This article fails to make the distinction between the synthetic hormone progestin and the naturally occurring hormone progesterone.