> some ancient peoples counted on their knuckles, using their thumb to point to each one. I don’t know how “ancient” you’re talking about: my mother (b. 1937)

> some ancient peoples counted on their knuckles, using their thumb to point to each one. I don’t know how “ancient” you’re talking about: my mother (b. 1937) used such a system and taught it to us as kids. FWIW she grew up in south east Asia.