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  1. Physics

    Putting Einstein to the test

    A NASA mission has found new evidence for Einstein's theory of gravity, but its final results have been delayed by unexpected problems.

    By Davide Castelvecchi
  2. Physics

    Fermilab could beat CERN to the punch

    A new particle accelerator starting up next year in Switzerland should finally discover the origin of mass, unless an older U.S. machine does it first.

    By Davide Castelvecchi
  3. Health & Medicine

    No heart risk from hormones taken near menopause

    Contrary to some earlier indications, hormone replacement therapy might not impart heart risks to women who take it during their 50s.

    By Nathan Seppa
  4. Physics

    Liquid origami

    A French team has created the first mini-origami figures that fold themselves around droplets of water.