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Merging Black Holes: A Matter of Some Gravity

Two black holes merging can cast off a few percent of their total mass as gravitational waves in just minutes. These are among the most luminous (yet dark) events in the cosmos - they could also send the final object off on a high-speed journey through the universe.

11 hours ago — Caleb A. Scharf

Industry and Guns, 1916

Reported in Scientific American , this Week in World War I: February 5, 1916. As World War One progressed, military forces desperately needed heavier and heavier guns: naval guns for arming the largest “superdreadnought” battleships; railway guns brought in to bombard distant targets with huge shells; siege artillery for smashing the hardest targets.

STAFF February 5, 2016 — Dan Schlenoff

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