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FACT: Many experts think it's to improve grip, but a British study from a few years back suggests otherwise. Researchers found that a fingerprint's ridges actually made it harder to hold flat, smooth surfaces, like Plexiglas, because they reduced the skin's contact area. Instead, they think our prints might help wick water off our fingertips or allow our skin to stretch more easily, which can protect it from damage and help prevent blisters. Other scientists have suggested fingerprints could improve our sense of touch. What we do know for sure is that no two people's fingerprints are the same, even among identical twins.—V. Patteson Lombardi, PhD, research assistant professor of biology at the University of Oregon (Check out these nine other body parts are as unique as your fingerprints, too.)

Circulatory System Torso The Cardiovascular System Of The Upper Torso Anatomy Medicine

As you time, your relaxing and every day average heart rate does not alter significantly. Nonetheless your highest possible heart rate reduces as you age due to the bodily effects of getting older, such as telomere shortening and associated deconditioning. Your maximum heart rate might be estimated by subtracting your age from 200.

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