principle is named after a person, no longer with us, a greek from long, long ago, and his name was aloysius j. principle. principle, all right. yes, good. [laughter] in honor of--who's buried in grant's tomb? ulysses s. tomb. - tomb. - tomb. that's right. that's why we call it grant's tomb, right? okay. who's main street named after? mister who? street. mr. street. you got it. all right. all right. physics types. we're hot today. if you'd be understanding this, you can answer this kind of question. well, let's s put it right back over in here. i'm gonna take a baseball, and i'm gonna put the baseball right here. and i'm gonna let the baseball sink a little deeper to here, and then finally to here. this is position "a," position b, position c. i got a question for you. at which position, "a," b or c, does the baseball experience the greatest pressure? c. check your neighbor. c. because it's deeper. greatest pressure. how many say it's c because it's deeper? how many say, "no, it's a trick question, hewitt. it turns out to be the same at all positions." show of hands. good, good. wonderful, won