To the Kenyan families school doesn't really matter because none of them are going on to college. Almost all of drop out of school and so they're spending their time learning things that are important to them.
I didn't go to film school so my learning was done out in public and showed up on the screen.
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But the mechanics of learning to 'throw your voice' are pretty simple. Anyone with a tongue an upper palate teeth and a normal speaking voice can learn ventriloquism.