Foot (unit) - Wikipedia
https://en.wikipedia.org/wiki/Foot_(unit)
Historically, the human body has been used to provide the basis for units of length. The foot of an adult Caucasian male is typically about 15.3% of his height, giving a person of 175 cm (5 ft 9 in) a foot-length of about 268 mm (10.6 in), on average. Archaeologists believe that, in the past, the people of Egypt, India, and Mesopotamia preferred the cubit, while the people of Rome, …
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