H2Oh!: Undershot-Overshot Paddlewheel
Located on the 1st Floor to the left of the Concourse as you reach the top of the stairs from the Lobby.
Turn the handle to control whether water turns the wheel from the over the top or from below the water wheel. Which direction does the wheel turn?
You may get wet interacting with this exhibit. Protective clothing will be available. A hand-drier is located on the wall.