(Can't see it? You can get to a non-Flash version on the Science Friday site.)
Now, the true geeks of bicycle design are all atwitter (probably even on The Twitters) about this one. Me, not so much. For as much as I get excited about the dullest minutiae of bicycles, front-end geometry leaves me cold. I geek out on many things, but as long as a bike goes in a straight line when I want it to and turns when I want it to, I'm happy. Everything in my stable does that a little differently, but that's all part of the fun.
My favorite takeaway from the video, however, is that the various "inventors" of the bicycle have brought us (through years of trial and error) to something pretty darn wonderful, even if science doesn't know exactly how or why it works. I'm probably taking this way too far, but I see a weird analogue to spiritual faith in that. The bike does what it's supposed to do. We can't explain how. It just does. My usual geeky insistence on knowing the "why" of everything should hate that, but for whatever reason, I find it comforting.