Meet the 30 Under 30 Coolest Entrepreneurs

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Drew Houston and Arash Ferdowsi, Dropbox

Drew Houston says file-syncing service Dropbox started the same as most tech start ups: "Two guys in their boxers, coding in a dark room." But the idea, which was born from his frustration with the disconnect between his own digital devices, has resonated with millions of individuals and businesses. Today, Dropbox boasts more than 25 million registered users, and sees more than a million files saved every five minutes. Read more.