>My favorite one is in Knuth's Volume 1, look up recursion. Heh, on another mail list someone's sig line goes "To understand recursion you first have to understand recursion". Haven't seen Knuths volume, but assume he says something similar? -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist