/u/davidcwilliams's posts in /r/askscience
At what point would running faster and faster ice water around an object begin to heat it due to friction?
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A friend asked for my opinion of a youtube video that looks a lot like a hoax for a perpetual motion machine. Could someone tell me what's going on in the video?
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If North America had never been 'discovered', approximately how long would it have taken for the Native Americans to develop cell phones?
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If every insect on earth disappeared tomorrow, could humanity survive? If not, how long would we have?
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