The US government will sell you freeze-dried urine
发布时间 2017-08-28 15:00:06 来源
摘要
The National Institute of Standards and Technology, NIST, sells Standard Reference Materials, or SRMs for short. They're analysed, quantified, and certified substances: everything from metals, to elements, to food items... to, yes, freeze-dried urine.
More about NIST and SRMs: https://www.nist.gov/srm
Edited by Michelle Martin, @mrsmmartin
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