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| There is a simple way to tell if an egg has been hard boiled or not. You put it on a flat surface and spin it. The boiled egg will spin for a long time because it's solid, and the raw won't because there's liquid inside and one of the laws of physics will slow it down. | |
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There is a faster, simpler, and more mind baffling way:
Slightly spinn the egg and stop it with the tip of your finger. As soon as stopped release the finger. A hard boiled egg will remain stopped, the raw egg will start to rotate again.