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.

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 ...

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 ...