Jinx wrote:
>> I would love to document that! The closest I've seen was black
>> rubber bags that expanded or contracted with heat. Any chance
>> he could send some pic's or tell us what the working fluid is?
> 
> A fluid that would probably do is methylene chloride. It's used
> in those "nodding bird" things that forever tip and drink out of a
> glass

I've found that beer works well for me.

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