Why we have four limbs and five digits on each

20 years ago I published research on why animals have as many limbs and digits as they do. I posited a Limb Law governing # limbs and limb length across a wide swathe of animals.

This also explains why we have ten fingers. And thus why we’re stuck with base 10 numeral systems. pic.twitter.com/A29b1yPECi

— Mark Changizi (@MarkChangizi) September 22, 2020