Kananga

Vf is often used as a placeholder for final velocity. That's my guess. https://www.google.com/#q=vf%20final%20velocity It certainly sounds more fitting for the context of the game and game-related math itself than velocity factor: http://en.wikipedia.org/wiki/Velocity_factor

Looks more like a sockpuppet than a centipede, if you ask me.

This is fun: Science Jr works just fine with something attached on each side. I've been pairing it up with a couple of mystery goo containers, it's quite convenient. But that's not the fun part. Try it with a pair of lt-1 landing struts and a mk16-xl parachute...

Making fireworks: