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What is the right side to hang toilet paper? Experts explain that it makes a difference for hygiene

A common debate about the correct way to hang toilet paper in the bathroom – with the flap facing out or toward the wall – may have hygiene implications. A research study from the University of Colorado Boulder analyzed, using lasers and cameras, the behavior of particles released during a toilet flush. The results showed that larger droplets fall quickly, while smaller particles can remain suspended in the air for long periods, which reinforces the importance of considering hygiene issues when organizing the bathroom.

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