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  1. Life

    These tube-shaped creatures may be the earliest known parasites

    Fossils from over 500 million years ago might be the first known example of parasitism in the fossil record, though the evidence isn’t conclusive.

    By Jonathan Lambert
  2. Humans

    The Dead Sea Scrolls contain genetic clues to their origins

    Animal DNA is providing researchers with hints on how to assemble what amounts to a giant jigsaw puzzle of ancient manuscript fragments.

    By Bruce Bower
  3. Neuroscience

    A new 3-D map illuminates the ‘little brain’ within the heart

    Microscopy and genetic studies yield a comprehensive map of the nerve cells found in the heart of a rat.

    By Laura Sanders
  4. Earth

    Chicxulub collision put Earth’s crust in hot water for over a million years

    An asteroid impact 66 million years ago caused hot fluids to circulate in the crust, creating conditions that may have been ideal for microbial life.