How a Manhole Cover Became the Fastest Manmade Object Ever

Half as Interesting tries to answer the question, “What is the fastest manmade object?” As you can figure, first they have to clarify the parameters of the question, defining the terms and such. But that leads us to a truly bizarre story of an experiment that is still somewhat classified. I really want to know if we have a 1957 manhole cover orbiting the earth, or possibly some other heavenly body.

Source: neatorama

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