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1answer
60 views

How thick (in molecules) would a piece of paper be if it was folded to the moon? [closed]

Apparently you can fold a piece of paper 42 times and reach the moon! 42 is the answer the everything after all! Oh, Douglas Adams, you clever son of a bitch. The reasoning behind this is that as you ...
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5answers
2k views

Estimate number of hairs on human head [closed]

A technique of vital importance at all levels in physics is estimation. This is obvious from the first chapter in any introductory physics textbook, but is also related to the working physicist. ...