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  1. Health & Medicine

    Shots often don’t reach muscle

    Standard 3-centimeter needles are too short to penetrate the layer of fat in the buttocks of most women and most obese men, so injected medications aimed at muscle often don't reach their targets.

    By Ben Harder
  2. Health & Medicine

    New software aids virtual colonoscopy

    A computer program helps radiologists spot dangerous growths in the colon without probing inside the body.

    By Ben Harder
  3. Astronomy

    Dark shadows

    New radio telescope images of the center of the Milky Way make an even more compelling case that a supermassive black hole resides there.

    By Ron Cowen
  4. Earth

    Microbe polishes off pollutant

    Researchers have determined how long a pesticide residue would remain in the environment if the microbe Pseudomonas pavonaceae didn't metabolize it.