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This doohickey is pretty neat:
http://www.stevespanglerscience.com/product/1582
It's more of a quick demo.... But the board could certainly be recreated
out of plywood. And if your experimenters are old enough to use some
tools, you could do lots of explorations with trying to create these,
testing different sizes of the boards, where you put the hole, how full
the bottle is etc. Old enough folks could even throw in some math trying
to calculate the COG...
Jonah Cohen
Outreach & Public Programs Manager
The Children's Museum
"Lisa! In this house we obey the laws of thermodynamics!"
-Homer Simpson
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