Calculus fans rejoice. Here’s a little joke just for you. This joke may be an oldie, but it’s still a goodie and with an image of a cool, cartoony cabin, it’s even better.
Impress your mathematically inclined friends and confuse the rest of the world all while staying stylish. What more could you ask for?
Everything you buy is guaranteed. If you're
not completely happy, we'll give you a