judgecorp writes: "Seventeen year old Nick D'Aloisio has sold his smartphone app Summly to Yahoo for an undisclosed sum. The app — created when he was 15 — aggregates news stories by topic and condenses them for time-strapped readers. D'Aloisio and his team will go to work at Yahoo when the deal closes."
We warn the reader in advance that the proof presented here depends on a
clever but highly unmotivated trick.
-- Howard Anton, "Elementary Linear Algebra"