Fortune cajoled this year's top 40 into sharing facts about them you won't find on the Internet (until now).
"I was once rejected by Google, Goldman Sachs, Lehman Brothers (phew!), and Napster (phew!!) for internships, in the same summer."
NEXT: Claudia Sender
Our 2013 edition of the list features young hotshots who are rocking businesses as diverse as air travel, natural gas, and genetic coding, as well as—if you can believe it— government.