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  1. Health & Medicine

    Risk Factor: Throat cancer linked to virus spread by sex

    Cancer of the throat and tonsils can arise from infection with a sexually transmitted virus.

    By Nathan Seppa
  2. Humans

    Lethal injection is inhumane, say researchers

    Prisoners killed by lethal injection may be conscious and experience pain and burning sensations while they asphyxiate.

    By Brian Vastag
  3. Animals

    Sex—perhaps a good idea after all

    A family of mites may be the first animal lineage shown to have abandoned sexual reproduction and then reevolved it millions of years later.

    By Susan Milius
  4. Health & Medicine

    A smart pill for seniors?

    A dietary supplement combo boosts older adults' performance on simple mental tests.