That sounds like a loaded observation. Were they (the nomads) suddendly
clustered together. Any refs re your comments?

I read an article on the day the psychotic computer HAL was born (January 19,
1996?) in Urbana ILL [grin]. the article was written by a man who did his PhD
on those nomads in 1968(?) and who returned to study them again in the mid
1990's. Much had changed, including the food habits, including the effort
worked each day for food (from about 3 hours a day as hunter/gatherers to 8
hours a day working in civilization).