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It's not just humans that calculate about giving, and it's not just humans who expect to be given something in return when they are co-operative. ... Orangutans do that too. However, other apes - chimpanzees, gorillas and bonobos - were less able or willing to play the game...


 animal intelligence orangutan reciprocity trade
Calls for a rethink of the dollar's status as world's sole benchmark currency come amid concerns about its long-term value as the U.S. Federal Reserve moved to pump more than a trillion dollars of new cash into the ailing economy...


 dollar USA currency trade economy global