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Tuesday, September 20, 2005

Shark-Induced Survival Pressure?

It has often seemed to me that taking a shower temporarily slows or stops menstruation. I haven't found any studies confirming this, though I'm apparently not the only one who thinks it can happen. If it's a real phenomenon, I wonder if it's another sign that humans spent some important period of their development as a species living largely in water. (That hypothesis may be thoroughly debunked by now -- I read about it years ago and haven't checked up on it.) Sharks can smell blood in water from a very long way away. If we did do a lot of prehistoric wading around, women whose menstrual flow stopped upon immersion in water would have had a huge survival advantage.

1 comment:

Paul Hager said...

Yes, it was debunked.

Turns out that human beings are very smart. Hunter gatherers typically know which native flora can be used to control menstrual cycles to limit fertility (if such flora are available).