Hint to puzzle #21: The Brick, The Boat and The Lake
We need to turn to Archimedes and his eureka moment here. This is physics but I suspect a lot of people understand the principal even if they don't think of it as physics.
When something sinks it necessarily displaces water to its own volume, it simply moves the water out the way raising the water level. But when something floats it displaces water with the same mass it has....
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