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What are some ingenious devices that do not require electricity or chemistry?
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January 6th, 2013
I have listed the ones that I can think of. I am sure there are plenty of others. How many of them can you tell how they work?
wheeled vehicles
clock, wristwatch
compass, lenses
loom, cotton gin, sewing machine
key and lock, combination lock
stapler, paper clip, velcro
pump, toilet, canal lock, siphon, sprinkler
water wheel, windmill
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