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microwave · how microwaves work · microwave door · faraday cage · science explained · how it works
Your microwave door is full of holes, so why doesn't it cook you? The door hides a metal mesh with holes far too small for microwaves to pass through, but plenty big enough for light. Hidden safety switches also cut power the moment you open the door.
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Some shopping carts have a hidden brake in one wheel.
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