Humans & Society

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stone tool

ROCK STEADY  A stone tool discovered at a 3.3-million-year old site in Kenya displays edge damage where sharp pieces of rock were removed, its discoverers say. 

hawthorn hedge row

Hawthorn hedges, such as this one in England, have played an outsized role in history.

monkey portrait

COUNTER INTELLIGENCE  An olive baboon named Pearl, shown here, and one of her troopmates could keep tabs on approximate quantities of peanuts placed one at a time in containers. Researchers say this counting-like logic, which humans use to count exact amounts, comes naturally to monkeys.

Humans & Society

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