WHAT'S INSIDE: HUMAN BODY

The human body is an amazing structure made up of many fascinating parts and systems. Learn about the human body and how its systems work together.
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How much do you know about the human body?

Millions of people have refractive vision problems -- when the eyes get blurry or can't focus on an object. Learn about four major types of refractive vision problems.

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The Heart: Introducing One Tough Muscle

The heart is one of the strongest muscles in the body. Learn about this extremely vital part of the body.

HEALTH: HUMAN BODY
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