I found this NOVA (PBS) website SUPER interesting.

Here is the introduction: "For over 350 years, some of the greatest minds of science struggled to prove what was known as Fermat's Last Theorem—the idea that a certain simple equation had no solutions. **Now hear from the man who spent seven years of his life cracking the problem, read the intriguing story of an 18th century woman mathematician who hid her identity in order to work on Fermat's Last Theorem, and demonstrate that a related equation, the Pythagorean Theorem, is true**."

**Andrew Wiles** devoted much of his entire career to proving Fermat's Last Theorem, the world's most famous mathematical problem. **In 1993, he made front-page headlines when he announced a proof of the problem, but this was not the end of the story; an error in his calculation jeopardized his life's work.** Andrew Wiles spoke to NOVA and described how he came to terms with the mistake, and eventually went on to achieve his life's ambition.

Check it out : http://www.pbs.org/wgbh/nova/proof/

There's even a teacher's guide!