Feb 6, 2013 8:00am PST
city, all you got to do is take a helicopter, just go up and wait three hours and come back down again, okay? what's wrong with that? that helicopter doesn't go up and just stay there. that helicopter is moving just as fast as the earth, and so it just keeps moving around like that, you see? so you're riding an airplane. you've been in an airplane? you flip a coin. when you flip a coin, do you have to adjust for the motion of the plane? let's suppose you're going this way 600 miles an hour. i'm like, "man, if i flip that coin, boom, "that coin gonna go bam, 600 miles an hour against the passenger in the back seat." - that happen? - no. why doesn't it happen? what if you were on a plane and someone says, "hey, how come, man? i flipped a coin, flipped it, come right back down." it's not that--i know i'm going 600 miles an hour. when i flipped it--in fact, you ever be in an airplane, you see a fly come by? man, that fly going 600 miles an hour... [laughter] ...with respect to the ground down below, isn't that true? but how about the coin flip? how come when you flip the coin it doesn't go
Feb 13, 2013 8:00am PST
this thing, we could generate electricity to light up cities. and sure enough, we do. and we have devices like this. and we put a waterfall over here and turn it, use the energy of that waterfall, potential, kinetic, rotational, mechanical, off it goes this light, huh? do that, or we could put a steam turbine here, direct some expanding steam against the turbine, against the paddle wheel and turn it. and so our civilization really rests on devices like this. but there's gotta be some energy input to be transformed over here. now, here's a neat little thing. when i turn this and i unscrew the lamp, it becomes easier to turn. easier to turn. why? well, when it's unhooked, there's no energy going off. and so what i'm turning against now is a friction. but when it's hooked up, i'm pushing against the friction plus the electricity. so let's--i can show you that. can i have a volunteer? could you come up here, please? what i'm gonna do-- you stand over here, and what i want you to do-- i'm not gonna look, i'm gonna look over here, okay? and i want you to unscrew that, and i'll tell you when it'