You have fifteen seconds. Using standard math notation, English words, or both, name a single whole number--not an infinity--on a blank index card.
Interesting, accessible journey through some of the mathematics of really big numbers, from "9999..."-repeating through to curious constructs you never learned the names of in school. See also MeFi.
The Whole World Burns is the rephrase miniblog, containing links and other miscellaneous trifles.