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One family generally dines on Chinese takeout while their neighbors eat home-cooked meatloaf. You say potato, I say potahto. And humans aren’t the only primate species with cultural differences: even in the same environment, different groups of chimpanzees use different tools

(PhysOrg.com) -- More than 500 years ago, Leonardo da Vinci observed a particular relationship between the size of a tree’s trunk and the size of its branches.