Sink or Float
http://www.surfnetkids.com/buoyancy.htm
"People have been aware of objects floating on water (or sinking) since before recorded history. But it was not until Archimedes of Syracuse came along, that the theory of flotation and the buoyancy principle were defined." Archimedes of Syracuse: The Father of Buoyancy | Blues Clues: Sink or Float? | BrainPOP: Buoyancy | PBS: Buoyancy Basics | Why Does an Ice Cube Float in Water? | Neutral Buoyancy Laboratory | It Floats! |
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