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  1. Archaeology

    Ancient South American populations dipped due to an erratic climate

    Scientists link bouts of intense rainfall and drought around 8,600 to 6,000 years ago to declining numbers of South American hunter-gatherers.

    By Bruce Bower
  2. Health & Medicine

    50 years ago, scientists tried to transplant part of a human eye

    In 1969, a doctor tried and failed to restore a 54-year-old man’s vision. Fifty years later, scientists are still struggling to make eye transplants work.

    By Tina Hesman Saey
  3. Life

    A gut bacteria transplant may not help you lose weight

    A small study finds that transplanting gut microbes from a lean person into obese people didn’t lead to weight loss, as hoped.