Walter Hickey/BI Mathematics has little surprises that are designed to test and push your mental limits. The following 12 simple math problems prove outstandingly controversial among students of math, but are nonetheless facts. They're paradoxes and idiosyncrasies of probability. And they're guaranteed to start an argument or two.

One of Yahoo 's newest employees is a 17-year-old high school student in Britain. As of Monday, he is one of its richest, too. That student, Nick D'Aloisio, a programming whiz who wasn't even born when Yahoo was founded in 1994, sold his news-reading app, Summly, to Yahoo on Monday for a sum said to be in the tens of millions of dollars.

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Code robots in javascript and watch them fight.