Human brains (1.4kg and 100 billion neurons) will come later, when all the wrinkles have been ironed out in rodents, and proper methods devised to analyse the results.

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And note that this is the situation among companies that have already adopted proper accounting methods.

ECONOMIST: Worse to come

The countries that he targeted also didn't have proper testing methods or any scientific laboratories to make sure they worked.

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And the only reliable way to make their case is, surely, to conduct a proper study, with children randomly allocated to teachers who use computers and teachers who use other methods, including the cheapest of all: chalk and talk.

ECONOMIST: Not helpful