A thread for exceptional facts

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Fresh water ostracods have the longest spermatozoa, relative to the size of its body, some have sperms that are more than 10 times their body length.
 
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Graham's number is an unimaginably large number that is a proven upper bound to the solution of a certain problem in Ramsey theory. It is so large that the observable universe is far too small to contain an ordinary digital representation of Graham's number, assuming that each digit occupies one Planck volume, possibly the smallest measurable space. Even the form a^b^c... is insufficient for this purpose; however, the last 12 digits are: 262464195387.
 
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