"Your mother's a [(δU/δL) / (δU/δC) | Sp=0] ≤ w - [(δU/δr) / (δU/δC) | S = 0], Trebek!"
http://www.guardian.co.uk/science/story/0,,2032704,00.html
Don't you just love science? :-)
Wow... why would they even WANT to apply differential calculus to that???? 0_o
I'm with Munerift...and differential calculus seems like a sexual encounter deterrant.
Economist / Mathematician Pick-Up Line:
"Baby, you're worth more to me than the whore outside, 'cause I wouldn't lose any reputation by screwing you."
oh yeah. smooooooooth.