Some folk spend time wondering about the origin of the universe.
More, it seems, ponder the significance of their belly buttons and, at risk of disturbing your attention to the breakfast Cornflakes, the lint that gathers in them. As a matter for serious scientific investigation it hardly ranks with the search for safe nuclear fusion, but it clearly absorbs thousands of otherwise sane and orderly Australians. We are trying to work out what causes the lint, and why it is blue. One brave listener actually shaved his belly button. His collection of lint promptly dropped to zero, but when the hair began to grow back, the lint returned.