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> a) these tablets are vastly more expensive than just hiring teachers locally - by orders of magnitude. This is not a remotely scalable scheme, and frankly research budgets would be much better put to use working out how to distribute cheap teaching materials through existing education networks.

I don't like to be harsh, but what is the quality of the teachers they are likely to get? A bad teacher can be worse than no teacher. By "bad teacher", I mean one who doesn't understand the material themselves.

> b) More perniciously, the tablets educate in English or Amharic: not in the local language of the population in question, which these children would otherwise speak; their parents are often not fluent in either.

It's a complex issue, but if people can only speak a local language they'll face heavy discrimination if they try to get a job elsewhere.

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