Question difficulty is brain buster! What was used to fill thermometers before mercury?

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Good question.
» Added by Jordan on January 13, 2007 at 6:08 PM
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Created January 13, 2007 (1:13 AM)
by DFox

Difficulty: 97%
Answered: 109x, 3x correct, 106x wrong
Category: Science
Tags: Themometer  Mercury  

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