I was watching Channel 4 news tonight and they had another one of those stories about melting ice flows etc etc in the north pole. Anyway to back up a point they were making in the story that when ice flows melt they do not raise the sea level they marked the water level in a glass of water iand then added 3 ice cubes. Speed the camera on a few hours after they have melted and the water level in the glass has not risen a mm....so who can explain to me why that is....I would have assumed the ice cubes melted to water and so would increase the water level in the glass. Try it yourselves!!