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Get the Popular Science daily newsletter💡 Breakthroughs, discoveries, and DIY tips sent six days a week. You’re busy. Somewhere along the way, the chair disappeared from meals. Breakfast over the sink, lunch at the counter. Sometimes, you can still hear your parents chiding you about how it’s “better” to sit down while eating. But is…

Get the Popular Science daily newsletter💡 Breakthroughs, discoveries, and DIY tips sent six days a week. Perhaps you are one of the many Americans who have a small boxy tank balanced precariously on their bathroom sink. Or maybe you’ve seen one at a friend’s house—the appliances known as water flossers, oral irrigators, or often by…