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?

Wouldn’t it just stay the same? The cannonball is displacing the same amount of water whether it’s inside the boat or at the bottom of the pool.