Water, soup, wet paint and other liquids often leave stains as they dry. They include "coffee rings" from dried coffee droplets, soup stains on the dining table, and the patterns salted snowmelt lays down on the pavement. ...
Sep 29, 2015 in Condensed Matter
Cells were discovered in 1676, and almost immediately afterward scientists began wondering why cells are so perfectly small.
Sep 29, 2015 in Cell & Microbiology