In 2011, at age 15, D'Aloisio closed a seed round of funding from Li Ka-shing. A year later, Summly launched, and within a month it had attracted 500,000 users and became the number-one news app in 28 countries. The Yahoo! sale capped off a remarkable run for someone not yet out of high school. But it's not mere technological savvy that sets D'Aloisio apart. Since long before he could shave, he has been driven by an intense curiosity and a desire to make some sort of mark on the tech world. Not just to create but to build and, yes, to monetize.