About two decades ago, Phil Bosua dropped out of college in Australia, where he was studying to be an electrician, to pursue his dream of becoming a rock star. He spent a few years playing with a band called Propeller, and did concert lighting for other bands, honing his knowledge of circuitry. Later he learned to code as well, creating compilations of public-domain books and making them readable in an app format. His apps were downloaded 6 million times, he says. The process taught him what’s possible with smartphone software.

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