+1 (no trail, rake necessary; tiny wheels with virtually no gyroscopic effect okay)

I just went through this with the Cat 5 clinic at Bethel, doing a last minute bonus tip for all the 5s on how to do a track stand.

I'm not a scientist, I failed out of Physics. I'm not coordinated at all, I can't do a lot of intramural sports well at all. But I can do a trackstand for a while.

If I had to do a trackstand on a bike that didn't roll, I wouldn't be able to. If I had to do one on a bike where the headset was locked, I wouldn't be able to. But give me a bike that rolls forward and backward and whose front wheel turns a bit and I'll be able to do a trackstand.

My grandfather (who I should point out was a noted scientist) tried to explain to my 6 year old brain but I didn't get it. He put it in a slightly different way - steer towards the side you're falling.

You do that minutely when you ride. You may not notice it when you ride or when you watch other adults ride but it's more exaggerated when you watch a 4 year old ride.