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  1. Health & Medicine

    A-beta on the brain

    A study of 18 comatose patients finds that as brain activity increases, concentrations of a protein linked to Alzheimer’s disease also increase.

    By Tina Hesman Saey
  2. Earth

    Past gasps

    Earth’s atmosphere during some past geological ages wasn’t as oxygen-deprived as previously thought, new experiments suggest.

    By Sid Perkins
  3. Life

    Pollinator manipulators

    Manipulating floral chemistry of a type of wild tobacco reveals push-and-pull strategy.

    By Rachel Ehrenberg
  4. Health & Medicine

    Eye protection

    A variant form of a gene called TLR3 offers some protection against the eye disease known as dry macular degeneration.

    By Nathan Seppa
  5. Space

    Clashing clusters

    Two space telescopes capture the titanic collision of galaxy clusters in an image that shows dark matter separating from normal matter.