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  1. Kissing, and missing, human cousins

    DNA paints a contested picture of Stone Age interbreeding.

    By Bruce Bower

  2. Polar bears have seen hard times

    Two genetic studies extend the Arctic icon’s lineage way back.

    By Susan Milius

  3. Quantum hops

    A little closer to teleportation and new computers.

    By Alexandra Witze

  4. Finding new ways to spell L-I-F-E

    XNA molecules join DNA and RNA in the genetic catalog.

    By Rachel Ehrenberg

  5. Prions may cause Alzheimer’s

    Similarity found with destructive protein behind mad cow.

    By Laura Sanders

  6. Earth’s new neighbor looks familiar

    Planet discovered in Alpha Centauri, just a few light-years away.