The heart needs a steady supply of oxygen and nutrients to keep beating — but the type of nutrients it relies on most depends on how healthy the heart is, according to new research.

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It's hard to compete against the Apple Watch or even an app on your phone when it comes to personal heart-rate monitors these days. However, Eko, a

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The heart is a powerful muscle that beats 100,000 times per year. It can even beat outside of the body. Discover 10 fascinating facts about your heart.