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We've all heard of a "sixth sense" and extra-sensory perception. So how many ways can we actually sense the world around us?

Learn about beta blockers from Discovery Health. Learn about facts, common causes, and treatment for headaches.

Dogs and fireworks just don't mix. And in the United States, the Fourth of July is a dog's worst nightmare.

If you're stuck at sea, salty water won't quench your thirst, but will it improve your oral hygiene? Learn if saltwater works as mouthwash.

A low oxygen level in your blood is a good indicator of a COVID-19 infection, but what exactly does that mean and how do doctors test for it?

What is a compounding pharmacist? Learn how a compounding pharmacist allows a physician to prescribe a very specific medication to a patient.

Not ready for a permanent tattoo? Get one that's designed to fade over time instead.

fMRI, or functional magnetic resonance imaging, looks at blood flow in the brain to detect areas of activity. Learn about fMRI and its invention.

Burns are a common beauty skin problem. Learn more about how burns work at HowStuffWorks.

Passionflower can be used in herbal remedies to treat anxiety, insomnia, and high blood pressure. Learn about herbal remedies using passionflower.

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