The most interesting thing you know...

Okay I lied, it doesn't have to be THE most interesting thing... But post a fact that is not commonly known that you think is a cool piece of knowledge for the back of your head.

I'll start off with one I learned tonight.

Nitromethane Used in top fuelers isn't near as combustible as gasoline, but has a stoichiometric air/fuel ratio of 1.7:1, which allows a heck of a lot more fuel to be burned at once when compared to gasoline engines.