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before and after daguerreotypes

BIG REVEAL To the naked eye, the woman in the damaged daguerreotype (left) looks ghostly. A synchrotron helped researchers restore her portrait (right).

a superconducting magnetic-levitation train in Japan

BUILT FOR SPEED  Superconducting magnetic-levitation trains in Japan smashed a world speed record in 2015 in a test run.  

general relativity

FLYING COLORS  Einstein’s theory of gravity has passed another test, based on the galaxy ESO 325-G004 (bright spot at center right). The experiment is the most precise check of general relativity on a galactic scale.

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