News

  1. Health & Medicine

    Male contraceptive shows promise

    Two hormones in gels applied to the skin effectively lower sperm counts, a study finds.

    By Nathan Seppa
  2. Humans

    Lead poisoning stymies condor recovery

    California’s iconic comeback species may need human help as long as even a small percentage of the carcasses they eat contain lead shot.

    By Susan Milius
  3. Physics

    Old battery gets a high-tech makeover

    Redesigned nickel-iron battery gives modern lithium-ion devices a run for their money.

    By Devin Powell
  4. Humans

    What Silicon Valley can learn from Mother Russia

    Imperial tax records from the last decades of the Empire offer clues to what makes a start-up succeed.