Arnold Mathijssen, a physicist at the University of Pennsylvania, is partial to pour-over coffee, which involves manually pouring hot water over ground beans and filtering it into a pot or mug below.

Carpet stains are an inevitable part of life, whether it’s from spilled coffee, muddy shoes, or an accidental pet mishap.

How to tackle spills and spots fast—from coffee, tea, and wine to mustard, tomato sauce, and moreBy Janet SirotoPhotographs ...