Study for the ACT/SAT and feed the world

We've added a link on our sidebar (that's over on the left side of the page) to FreeRice.com. It's an extremely cool charity-click site, with a twist:

You answer a vocabulary question. For each question you answer correctly, a donation (20 grains of rice) is made to feed the world through the United Nations World Food Program. The program counts how many grains of rice you've donated; it also tracks your vocabulary level. So, it's reinforcing on two dimensions. Megakudos to whoever thought of it!