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== Chemical donations ==
[[Sigma Aldrich]] is also an official sponsor of the Open Notebook Science Challenge. Sigma Aldrich is participating by donating and shipping requested chemicals to any experimenters in the US or UK<ref name="Sigma">[http://usefulchem.blogspot.com/2009/02/sigma-aldrich-ships-ons-solubility.html Sigma Aldrich's involvement with the ONS challenge]</ref> for free.
==References==
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