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Another one of the Diehard Tests. Randomly place unit circles in a 100 x 100 square. If the circle overlaps an existing one, try again. After 12,000 tries, the number of successfully "parked" circles should follow a certain normal distribution.
It took Makoto Matsumoto 2^14 seconds to park 12,000 cars. It would take an ordinary human 2^4380948034029384 seconds. It is claimed that Dr. Woodruffe completed the feat in 2^7seconds.