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Selecting a random sample from a set is simple. But what about selecting a fair random sample from a set of unknown or indeterminate size? That’s where reservoir sampling comes in, and [Sam Rose] has ...

Stool samples can help doctors diagnose some health conditions. Tips for collecting a stool sample include urinating before collecting the sample and using any tools that the sample kit provides.

When the Fagradalsfjall volcano in Iceland awoke in spring 2021 after 815 years of slumber, the geochemists and petrologists at the University of Iceland knew they wanted a sample. It was a rare ...