what lester pelton did was this: he redesigned the paddles. he made the paddles like that. so the water would come down, make a u-turn and bounce back out again. and he made the paddles such-- in such a way to make the water bounce. and when the water bounced off the paddle wheel, more oomph. and he made more money on this than most of the gold miners did on their claims simply using the laws of physics. you apply more impulse to that spinning wheel by bouncing the water than just simply catching it or stopping it. ain't that neat? any questions to this time? okay. here, we have a little device called an air cart. and right now, there's a lot of friction with these things. see, it's a-- they kinda slow down very quickly. a body at rest doesn't remain at rest very long. i mean, a body in motion doesn't remain in motion because i've got a opposing force. and a force of friction, of course, is slowing these things down. what i'm gonna do, though, is i'm gonna-- this is like a vacuum cleaner in reverse. i'm gonna throw on the switch and it's gonna blow air jets. air is gonna cu