the Wheel and Dating PIE

[JoatSimeon at aol.com]

And, for example, cattle dairying -- well-attested from the PIE vocabulary,
with words for 'to milk' (cows), curds, whey, 'cow rich in milk', butter,
etc., is generally dated to the mid-4th millenium BCE. (eg., McCormick, 1992,
"Early Faunal Evidence for Dairying", Oxford Journal of Archaeology, 11,
201-209).

Note also that the genes for lactose tolerance (ability to digest cow's-milk
as an adult) show a distinct drop-off in Mediterranean Europe and the Near
East, but are high in northern and eastern Europeans.