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Does human DNA evolve over time? and if so, is there a point in our species past where we're still considered human, but no longer compatible to have their offsprings or vise versa?

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Does human DNA evolve over time? and if so, is there a point in our species past where we're still considered human, but no longer compatible to have their offsprings or vise versa?	1
How fast would a car have to hit a stationary car in order to kill the occupants of the stationary car?	1