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An Inca Using A QuipuIllustration of the Keeper of the Quipu, a device used by the Incas to record mathematical data and possibly non-numerical information as well, 1565
Antique illustration of man with abacus
Maternal Education, by Eugene DelaplancheIllustration of a maternal Education, by Eugene Delaplanche
Vasco De GamaAntique illustration of Vasco De Gama from Magyar encyclopedia Tolna world history published 1910
Colourful plastic rings stacked on pole with smiling clown head at the top, close up
Mature man holding blank sheet of paper posing in studio (B&W), portrait
Woman counting change, close up of hands
Performing Dog1921: Rex, the thought-reading dog, in action at Olympia Circus, in England. (Photo by Topical Press Agency/Getty Images)