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From the website: "You've heard the common refrain, 'Oh, I'm so bad at maths!' But for up to eight per cent of us, a condition called dyscalculia means numbers are a serious struggle, with serious consequences. Scientists are now revealing its biological basis, and in Australia there's a push for it to be seen as a legitimate and unique disability."

Interesting but long article describing the mathematical skills of Amazonian tribes people. Their understanding of maths is very similar to kindergarten and Year 1 students.