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  1. Health & Medicine

    Sleepy Heads: Low fuel may drive brain’s need to sleep

    A new study supports the hypothesis that dwindling energy stores in the waking brain induce sleep.

    By Kristin Cobb
  2. Physics

    Heavy Suspicion: Elemental discoveries trace to fake data

    A prominent physicist has lost his job following allegations that he fabricated the evidence underpinning his team's now-discredited discovery of elements 116 and 118.

    By Peter Weiss
  3. Health & Medicine

    Mixed Blessing: Unusual gene helps heart, hurts immunity

    People carrying a variant of a gene that encodes an immune protein called toll-like receptor 4 have a weaker defense against infections but appear to be less prone to heart disease.