"You can see essentially a very high performance cluster the size of a desktop, at the cost of a desktop, " says Nvidia board member Steven Chu, a Nobel Prize-winning physicist and director of the Lawrence Berkeley National Laboratory.

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Stunningly, the typical answer-based tutoring systems average an effect size of around 0.35 standard deviations, and all three of the step-based, substep-based, and human tutoring cluster around an effect size of 0.75 standard deviations.

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But the next year they double the size of their cluster, or they start another cluster.

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And when we asked her if she was convinced that it was not a random cluster of the kind we would expect in a place the size of Britain, she was emphatic.

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