Maggie Wachter, a mother of two in Philadelphia, has heard every rinse-and-repeat excuse in the book to skip a bath. Recently, Wachter’s 11-year-old son declared that no shower was necessary after a ...
Scientists and engineers at the National Institute of Standards and Technology (NIST) have devised an optical device that measures the flow of extraordinarily small amounts of liquids, as little as 10 ...
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