In 1960, NASA launched rhesus monkey Miss Sam to test Mercury's escape system, and she reached 1,800 mph and 9 miles, then returned in overall good condition

Discover how Miss Sam, a rhesus monkey, played a pivotal role in NASA's Mercury launch escape system test, reaching 1,800 mph and 9 miles high before returning safely. Her journey paved the way for human spaceflight.

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