This week marks the 55th anniversary of the first chimpanzee in space when Ham lifted off as part of the United States’ Mercury Redstone-2 (MR-2) mission in 1961 that laid the foundation for human spaceflights. Although Ham returned safely to Earth, other primates died during American test flights in the 1940s and 1950s. For more, visit http://buff.ly/1o5f2Vu
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