/u/KyroDCK's posts in /r/askscience
If the world had some sort of apocalypse, how many people would be needed on earth to repopulate without incest of the offspring?
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If a skateboard ramp was on a truck, and the person going down was going X/mph and the truck was going in the opposite direction at the same speed the skateboarder was leaving the ramp, would the skateboarder come to a complete stop once exiting the truck? Which direction would he go in?
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