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Monkeys master mental math

Everyone has had that awkward moment at a cocktail party or at the lunch table: You: Congratulations on the little one; she’s beautiful! When was she born? New mother: Thank you, thank you. Well, let’s see, I’ve kind of lost track, but with today being January 14 and her birthday being December 17… You: Oh, so she’s already 5 weeks old then. Wow! New Mother: Uhh…no. She is exactly 28 days old. Although mistaken mental math has embarrassed us all, we humans still reign supreme in the nonverbal representation of numerical values, right? A new study in PLoS aimed to 


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