@cpengel just posted a twittered about this amazing app phun that was created by Emil Ernerfeld as some sort of phun w/ physics tutorial. From the sample video it looks like he stumbled across a very cool, addictive, and from the looks of it extremely intuitive app.

Having spent most of my waking hours over the last 3 days thinking about how to make complex concepts simple, intuitive, and efficient, this is definitely right up my alley.

WPvideo 1.10
(download)

Too bad there is no OS X version…