. >> on the wind-swept island of alderney, the nazis operated concentration camps on british soil. decades later, the british government is investigating how many people were killed here. >> why might the british government have tried to cover up what happened on the channel islands? >>> so, are you math geniuses? >> not at all. >> how did these high school students prove an ancient mathematical equation that was thought to be impossible for 2,000 years? >> we start with just a regular right triangle where the angle in the corner is 90 degrees. then we start creating similar but smaller right triangles and then it continues for infinity. am i going a little too -- >> you've been beyond me since the beginning. >> oh. >> i'm lesley stahl. >> i'm bill whitaker. >> i'm anderson cooper. >> i'm sharyn alfonsi. >> i'm jon wertheim. >> i'm cecilia vega. >> i'm scott pelley. those stories tonight on "60 minutes." get his little puppy diploma? how much have i been spending on this little guy? when your questions about life turn into questions about money... there's erica. the virtual financi