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I moved and left my lava lamp in the garage for a while, over a year. I guess the summer wasn't too kind and much of it oozed out of the cap. It got me thinking about the shape of the bottle. Narrowing at the top must help the contents cool faster so they fall back down. In the garage nothing cooled so it just oozed out from around the cap. So those replacement bottles can come in handy I guess.
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