Can you pass this 1970s quiz?
1970s
2.51 M People
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Which spacecraft was the first to circle another planet?
Mars 5 Mariner 9 Apollo 2 Mariner 1
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1960s
1.53 M  Players
In 1964, world heavyweight champion Cassius Clay changed his name to what?
Sports
2.86 M  Players
Which sport was only added in the Olympic program at the 1988 Summer Olympics?