Weekly Health Quiz: Pain, Covid and Intense Exercise

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High-intensity interval training, or HIIT, has been tied to this health benefit:

Weekly Health Quiz: Pain, Covid and Intense Exercise

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Pain in the ears when you wear a hat, or a nose that reddens when you wear sunglasses, may be a sign of this autoimmune disease:

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About what percentage of Americans ages 12 and older have been fully vaccinated against Covid?

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The Biden administration is pushing ahead with a rule requiring Covid vaccination or weekly testing for all companies with at least this many employees:

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Autopsies of people who have died of Covid have found coronavirus in this organ:

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These cells (from the Greek word for glue) were once thought to be just nervous-system connective tissue, but scientists increasingly think they play a critical role in chronic pain:

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According to the late Dr. John Sarno, author of "Healing Back Pain," most chronic pain is caused by: