Some sample questions from this category:
* Who, in 1952, was the first sex-change operation performed on at Copenhagen Hospital in Denmark?
* Which World War II leader died in March 1953?
* In 1954, the U.S. Navy launched the world's first nuclear powered submarine, the Nautilus. Who was the head of the Navy's nuclear submarine program?
* Rock 'n Roll is said to have started in 1955 with the release of one of these recordings. Which?
* Jacques Cousteau, a world leader in oceanographic studies obtained photographs of ocean depths down some four and a half miles in 1956. What was the name of Cousteau's research ship?
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