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adrienne
on Feb 5, 2017
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The Purpose of Sleep? To Forget, Scientists Say
Modern medicine also uses leeches.[1] Their saliva is a natural anticoagulant and their sucking promotes oxygenation.
1:
https://en.wikipedia.org/wiki/Leech#Medicinal_use_of_leeches
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1: https://en.wikipedia.org/wiki/Leech#Medicinal_use_of_leeches