Labels:text | screenshot | font OCR: Leonardo advocates something as simple as swimming lessons for humans and offers advice on how to escape a whirlpool. One should simply "seek the reflex current that will cast him out of the depths." C A simple solution to the problem of canal silt proposes that "the bottoms of rivers and ditches are to be trampled by big animals so as to cause muddy waters, which are let out and which will then deposit their soil as they slow down." D This page also includes some descriptions of the types of natural phenomena that Leonardo
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