Re: SI
@Def
"Arbitrary base-60 measurements" go back to at least the Babylonians. Most of us cary an easy way of counting to 60 around with us - Using the thumb of one hand start counting by touching the top joint of the same hand's little finger, then the second joint, then the third; now move on to the ring finger and count the three joints, then the middle finger, and then the index finger giving a total of 12 - Now count off the thumb of the other hand for the first 12, then repeat and count off the index finger for 24, middle for 36, ring for 48, and little finger giving a total of 60. The number 60 is divisible by 2,3,4,5,6,10,12,15,20 and 30 - So for people who traded (and needed to count) a much better system than stopping at 10 (only divisible by 2 and 5), when you run out of fingers (and toes at 20 [sandal wearers?] divisible by 2,4,5 and 10).
Biting the hand that feeds IT
