ANSWERS: 5
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They have a ball in them to help mix the paint when shaken.
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Because they have a little ball in them that assists to stir any sediment in the can when you shake them.
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http://ask.yahoo.com/20040511.html http://science.howstuffworks.com/aerosol-can.htm The second one is very useful I would look at all of it but it is a bit lengthy.
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to make a noise.
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I think it is a Marble
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