Ask HN: Review my side project: Sqrt(2)

Hey there, HN! In our spare time, we've been working on this side experiment: what would happen if a social news site required people to demonstrate intelligence in order to submit / vote on news stories?

Thus is born Sqrt(2), here's 100 invites:

http://1.414214.com/login.html?m=newsyc

We're really concerned about scaling, so we'll increase the ceiling on the invite code as quickly as we can confirm our server's not going to explode. If you can't get in, try again in a few hours.

Heading off a couple of things:

Yes, our presentation sucks. How can we make it better without annoying everyone with a long-winded description every time they log in? We've agonized over trying to make the WTF page clear without wasting anyone's time, but you guys are the test of whether it actually makes sense. Remember, the audience is smart, cool people such as yourselves, not grandma.

"But I don't have time to solve crappy puzzles!" I'm busy too. But I enjoy solving little puzzles as a break from coding. If you don't "have time" to do X, it's because you don't make time to do X, because you view X as inferior to whatever else it is you're doing. Which is fine. But I want news from people who occasionally make time for logic/critical thinking, so if you don't, I don't particularly care for your news. No offense. Complaints about the specific nature of the specific puzzles are, of course, perfectly valid. I've coded some things that interest me, but I would love suggestions on what interests you.

Is this going to work? Has something similar been done before? We have no idea! It just seemed like a neat experiment and it was painless enough to code. What do you think?