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Originally posted by Cole DeSteele
I really liked your idea of evolution being responsible for the traditional 'Greys" appearance. Interesting thought!
Many men in later medieval England were capable of shooting bows from 670–900 N (150–200 pounds) — skeletons of archers have been studied, revealing spur like projections on the bones where their over-developed muscles pulled. However, these men did train daily from a very young age and their lives depended on being able to use such powerful bows.
There are modern day examples of men who can draw such powerful bows. Mark Stretton currently holds the world record for shooting a 900 N (200 pound) longbow.
The paradox is this: suppose a man travelled back in time and killed his biological grandfather before the latter met the traveler's grandmother. As a result, one of the traveler's parents (and by extension the traveller himself) would never have been conceived. This would imply that he could not have travelled back in time after all, which means the grandfather would still be alive, and the traveller would have been conceived allowing him to travel back in time and kill his grandfather. Thus each possibility seems to imply its own negation, a type of logical paradox.