Mensa—the club for people who know they're smarter than you—is offering its home test for free during the month of January. It's an IQ test that takes 32 minutes to complete and at the end it'll tell you whether you're Mensa material. Although acing this test won't get you admitted to Mensa—that test has to be taken in a controlled environment—it's a really good approximation, and a good score would certainly be good enough to declare yourself a genius, at least to your dumb friends.