The mere thought of fingernails scratching a chalkboard can be enough to set some people on edge. Now, a new study may help explain why. Researchers say the shape of the human ear may amplify certain ...

A baby’s hands and fingers are almost impossibly tiny, yet those teeny fingernails on the tip of each digit are surprisingly dangerous — to a newborn’s delicate skin, at least. New parents don’t want ...

The fingernails scratching the chalkboard produce sound in the frequency range between 2000 and 4000 hertz. Human ear is more sensitive to sounds in this pitch range. Moreover, the anatomy of ear ...