Many people think that the symbol for infinity ∞ means that you go "round and round this crazy loop forever". OK I can see that but I have a much more rational explanation for the symbol. To me the symbol looks like an hourglass tipped on its side. With the hourglass tipped on its side, how long will it take for the grains of sand to fall through? Until infinity!
You can learn more about the concept of infinity here: http://www.sixtysymbols.com/videos/infinity.htm
