query: When did Benjamin Franklin supposedly perform his kite experiment?
passage: Kite experiment
Franklin's kite experiment was performed in Philadelphia in June 1752, according to the account by Priestley.[5] Franklin described the experiment in the Pennsylvania Gazette in October 19, 1752,[6][7] without mentioning that he himself had performed it.[8] This account was read to the Royal Society on December 21 and printed as such in the Philosophical Transactions.[5] A more complete account of Franklin's experiment was given by Joseph Priestley in 1767, who presumably learned the details directly from Franklin, who was in London at the time Priestley wrote the book.[5]
passage: Nuclear testing at Bikini Atoll
The United States was engaged in a Cold War Nuclear arms race with the Soviet Union to build more advanced bombs from 1947 until 1991. The first series of tests over Bikini Atoll in July 1946 was code named Operation Crossroads. The first test was dropped from an aircraft and detonated above the target fleet. The second, "Baker", was suspending under a barge. It produced a large Wilson cloud and contaminated all of the target ships. Chemist Glenn T. Seaborg, the longest-serving chairman of the Atomic Energy Commission, called the second test "the world's first nuclear disaster."