The Flood

Much fun was had last week when a science supporting actor had a TV debate with a "young earth creationist". This species of person apparently goes about pretending to believe that the earth is about 7000 years old and every  word of the bible is true. There was it seems some discussion of Noah, the flood and all that. Here is a thing: the flood covered the entire earth, and the rains eventually stopped. The waters abated and dry land was exposed. Here's the question - where did the water go? If the whole earth was covered in water there would be nowhere for it to drain away to. If it evaporated it would fall again as rain and start the whole mess off again. So where did the water go? To my utter delight I now discover that Leonardo da Vinci made this exact point! Try this on your local friendly creationist. Harmless amusement.