Tuesday, May 13, 2008

American scientists (additional information)

Last week I wrote about a FDC I received from the USA bearing two of the four stamps issued recently by USPS and honouring American scientists. I forgot to mention one interesting information related to the stamp picturing Gerty Cori. It appears that this stamp contains an error in the chemical formula displayed on the background of the stamp. I’m not qualified to explain you more in details the error, you can read more about it here.

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