A viral travel trick suggests placing a sheet of paper over a sink drain and covering it with an upside-down glass before leaving home. The idea is based on real plumbing science involving the P-trap, the U-shaped pipe beneath sinks, showers, and tubs. This pipe normally holds a small amount of water that blocks sewer gases, unpleasant odors, and small pests from traveling back through the drain…. Continue Reading 🔽
