Approx 2.5 mm across.
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It depends on how big your head is.
For a newborn infant, definitely. For a teenager, not that much. For an adult, not really.
Easily. folded to a triangle the length of the hypotenuse would be 31.11, and it would be very unlikely to find a human head that big.
No, I don't think so. I know someone who has a big head, but that person is short. So here's your proof :]
The probability of 2 coins both landing on heads or both landing on tails is 1/2 because there are 4 possible outcomes. Head, head. Head, tails. Tails, tails. Tails, heads. Tails, heads is different from heads, tails for reasons I am unsure of.