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  1. Archaeology

    Stone-tool makers reached North Africa and Arabia surprisingly early

    Ancient Homo species spread advances in toolmaking far beyond East Africa.

    By Bruce Bower
  2. Astronomy

    Astronomers have measured all the starlight ever emitted

    Astronomers used distant blazars to tally up all the stray photons roaming through space.

    By Lisa Grossman
  3. Neuroscience

    Zaps to a certain spot in the brain may ease depression

    When implanted electrodes stimulated a brain region just behind the eyes, people’s spirits were raised immediately.

    By Laura Sanders
  4. Health & Medicine

    Kids born in August are diagnosed with ADHD more than kids born in September

    August-born kids have higher rates of ADHD diagnosis than kids born in September in U.S.