Those 'crow's feet' at the corners of your eyes really do deserve to be called laughter lines, according to a recent study by researchers from Binghamton University in New York.

Using skin samples from people aged 16 to 91, the team confirmed the repeated stretching and releasing of skin in one direction strains the aged tissue in a way that leads to wrinkles in a similar fashion to the wearing of creases into your favorite pair of denim jeans.

"This is no longer just a theory," says biomedical engineer Guy German. "We now have hard experimental evidence showing the physical mechanism behind aging."

Sleep Wrinkles Are a Real Thing, And It's All About How You Sleep

While previous studies have explored the mechanics of dermal stress and degradation, this investigation is the first

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