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how do re-useable hand warmers work

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o8sp | 17:50 Sat 14th Jan 2006 | Science
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how do the re-useable hand warmers with the metal discs work? what is the chemical reaction that occurs and how does boiling reset the warmers?
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Avatar Image fo3nix
this should help:

http://en.wikipedia.org/wiki/HotBag
17:49 Sun 15th Jan 2006

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