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Originally Posted by JosephM
or the giant rotating ball in the front supported by the water you can push.
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That's what I said to Heidi as we passed it on the way home. But I thought Dave said "in" the museum, but maybe he said "at" the museum.
PS: It was fun, at the end of the museum visit, when a bunch of us were running around the big rotating ball making it go really fast, then stopping it and making it go the other way. One of the students determined that we could stop it a lot faster if we ran around it with each person's hand in one spot, and slowly stopped our movement, instead of just trying to push on it while standing in one place.