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  1. Plants

    Cretaceous Corsages? Fossil in amber suggests antiquity of orchids

    Orchids appeared on the scene about 80 million years ago, according to evidence from a bee that collected orchid pollen and got trapped in amber.

    By Sid Perkins

  2. Barely Alive: Ancient bacteria survive in the slow lane

    Microbes locked in 500,000-year-old permafrost appear to breathe and show other signs of very slow life.

    By Brian Vastag

  3. Share Alike: Genes from bacteria found in animals

    Bacteria swap genes all the time, but it now appears that they can give their DNA to some animals as well.

    By Patrick Barry
  4. Math

    Kidney Matchmaking

    A mathematical optimization strategy for pairing patients who need kidneys with willing donors could increase the number and quality of transplants.