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The first one was also asked on security.stackexchange.com (http://security.stackexchange.com/questions/25684/how-can-i-...). The last one would probably be on-topic on Physics.SE.

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Nice find. However, go ahead and actually compare the two answers. There is no way my grandma would ever be able to follow the explanation on StackExchange, especially compared to the answer on Quora.

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