March 1 marks 71 years since the U.S. used its biggest ever nuclear weapon – on Bikini Atoll in the Marshall Islands. The bomb was 15 megatons, 1,000 times more powerful than the bomb dropped on Hiroshima. Between 1946 and 1958 the U.S. detonated 67 nuclear weapons in...

Castle Bravo test March 1st marks seventy years since the US used its biggest ever nuclear weapon – on Bikini Atoll in the Marshall Islands. The bomb was 15 megatons, a thousand times more powerful than the bomb dropped on Hiroshima.  On this day we acutely remember...