Any red-blooded American who has taken high school chemistry in the last fifteen years or so, or any red-blooded American who watchs public television, has heard of the august Professor Roald Hoffmann and his World of Chemistry television series. Professor Hoffmann does theoretical chemistry at Cornell, and is a damn cool guy.
6.02x10^23. Anybody who has taken chemistry may remember that number as Avogadro's Number, the number of molecules of any gas present in a volume of 22.41 L and is the same for every element. Fun stuff, eh? Read more about one of the basics of chemistry at Chemistry.co.nz's Avogadro's Law page. For more mole fun, including jokes, try the National Mole Day Foundation. Why does Avogadro like blue cheese? Because it's mole-dy.