Imagine a child at age 10 needing to count on fingers to tell you whether 6 is bigger than 5. That's not as rare as you might think. Affecting some 2.5-7.5% of the population, researchers say, the learning disability dyscalculia prevents people from comprehending or manipulating numbers, even small ones, easily. Though you may have never heard of it, the condition is much more than being bad at math. "You need to hear people suffering from dyscalculia, how hard it is for them to do everyday things, just going to the shop, counting change," says Roi Cohen Kadosh, a research fellow...
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