There were no significant differences in performance between the groups at the start of the study yet TRNS was found to improve the speed of learning for both calculation and rote learning tasks.

BBC: Brain stimulation promises 'long-lasting' maths boost

To put this in perspective, if the Earth's 6.4 billion people each did one calculation per second, we would be working at about one ten-thousandth of the speed of TeraGrid.

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