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IMAGE BY JING-DONG JACKIE HAN, PEKING UNIVERSITY How old are you, really? The answer is written on your face. Our "biological age" reflects the health of our cells and organs, and can differ from our actual age by years—but it's slippery to pinpoint. Now, inspired by a centuries-old Chinese practice of "reading" the face, scientists have developed a tool that calculates that number. For many of us, that "could be a wake-up call." SAGGY SKIN = INFLAMMATION?

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What happens during menopause? Science is finally piecing it together. + READ THE FULL STORY Not all fat is created equal. This 'good fat' could keep us youthful. + TURNING WHITE FAT TO BROWN FAT Millions of people suffer from long COVID—but why? + LEARN MORE

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