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  1. A Spitting Image of Health

    How saliva can help doctors diagnose disease.

    By Susan Gaidos

  2. Darwin’s Tongues

    Languages, like genes, can tell evolutionary tales.

    By Bruce Bower

  3. Space Eats

    Astronaut journey to Mars requires new age nibbles.

    By Alexandra Witze
  4. Chemistry

    Headache tree is a pain in the brain

    Following a gardener’s lead, researchers discover an ingredient in bay laurel that causes uncomfortable swelling of cranial blood vessels.

    By Rachel Ehrenberg
  5. Paleontology

    Tooth stranger than fiction

    A mammal fossil unearthed in South America resembles ‘Ice Age’ saber-toothed squirrel.

    By Alexandra Witze
  6. Life

    The origin of orbs

    Spectacular web designs trace back to a single spider origin.