then 10 years later, in 1984, my good friends dave vasquez and craig dawson came into my classroom and videotaped the course again. and 12 of those ended up as the tapes distributed by addison-wesley. one of those, i would like to show you now, features my good friend paul robinson, who turns out to be the author of the laboratory manual to the conceptual physics program. let's drop in in that class. don't touch it now. don't touch it now. okay. you'll be harmed less if you touch it now. you can trust me. okay. here? okay, right there. that's right on. yeah. [laughter] oh, that's beautiful. stay holding it. okay. look this way. yeah, that's nice. oh, that is nice. that's fantastic. look, look, look, look. oh, that's nice. that's nice, very nice. okay. now, i tell you what? could we all hold hands today? yeah, okay, yes, yes. let's all hold hands. back here, john. right--that's it, right, just come here. let's--here we go, go on. okay. dave, get that. okay, okay. okay, don't break the chain now. anyone wearing pacemakers here? [laughter] okay. i hope not. if you're wearing a pacemaker,