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  1. Health & Medicine

    Asthma may add to sleep apnea risk

    A long-term sleep study strengthens the link between the two breathing disorders asthma and sleep apnea.

    By Nathan Seppa
  2. Health & Medicine

    More oxygen may lead to more tumors

    Lung cancer risk drops at higher elevations where the air is thinner.

    By Tina Hesman Saey
  3. Animals

    Amazonian bird may act the part of its hairy caterpillar disguise

    A rare view of a baby cinereous mourner feeds debate over whether the bird both looks and acts the part of a toxic hairy caterpillar as defense against predators.

    By Susan Milius
  4. Materials Science

    Graphene’s allure becomes magnetic

    Single-atom-thick sheets of carbon called graphene can be magnetized with the help of an insulating magnet.