When you've got nothing better to do!
Remember how great it was to be a kid and know everything? Now you can re-live those moments of clarity and wonder how it all went wrong with 15 shining examples of how ass-backward our educational system is. Seriously, why would you want to learn trigonometry when you can see buxom strippers in every equation and co-efficient? (Seriously, I’m not sure what all those math words mean anyway.)