re: #71 maddogg

Actually, iron will float nicely on mercury or liquid lead, uranium, gold or any element of higher density in a liquid state.

Question: You are standing in a boat full of iron cannon balls floating in a swimming pool. You pick the cannon balls up and toss them over the side into the pool. Will the water level in the pool rise or fall?

Fall….. when the cannon ball was in the boat, it was forcing the boat to displace the weight of the cannon ball in the form of water. When thrown over the side, the cannon ball displaced less than its weight in water and sank.