The news clip below presents an argument proving that at least two New Yorkers must have exactly the same number of hairs on their heads! For this problem, just suppose you knew the number of hairs on your head, as well as the exact number of hairs on anyone else's head. Now multiply the number of hairs on your head by the number of hairs on your neighbor's head. Take this result and multiply by the number of hairs on the heads of each person in your town or city. Continue this process until you have done this for everyone in the entire world! Make a guess (you can use scientific notation, if you like) about the size of this answer.