If you've ever been in a public restroom with a small child, you may have heard them complain about the hand dryers or seen them covering their ears as they walk by them.

It turns out, there's a scientific reason for that.

Nora Keegan of Calgary, Canada just published a paper in a medical journal with research proving that hand dryers may be detrimental to children's hearing. But the coolest thing? She's only 13.

When she was younger, Keegan noticed that her ears would sometimes ring after she starting using hand dryers in public restrooms. "I also noticed that children would not want to use hand dryers, and they'd be covering their ears," she told NPR.

So at age nine, she decided to explore whether automatic hand dryers might actually damage children's hearing. Between 2015 and 2017, she tested the volume of 44 hand dryers in public restrooms in Alberta, Canada. Using a decibel meter, she measured the noise levels of different hand dryers from various heights and distances.

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