When Marissa Mayer decides to buy your app for $30 million, you know you’re doing pretty well. When you’re only 17 at the time, “doing pretty well” is an understatement. Programming whiz kid Nick D’Aloisio sold Summly, a news-reading and summarizing app, to Yahoo in March. Other investors include Wendi Murdoch, Yoko Ono, and Ashton Kutcher.