It's a site that has games that test your ability to recall things.
I can by now name 93 elements in the periodic table (and mostly where they go), all of the President's last names, all of the countries of Europe (Kosovo just became independent, so that threw me at first -- in fact, if you look at the stats page for that one, it lists 46 right as the highest possible score). I sometimes know all the oscar winners from 1970-present, but I tend to forget some now and then.
On the other hand, I can only name just over 30 state capitals.









