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https://www.youtube.com/watch?v=rDGqkMHPDqE

The smallest bones in the body are found in the ear.

Over half the body's bones are in the hands and feet.

The only joint less bone in your body is the hyoid bone in your throat.

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https://www.youtube.com/watch?v=jqy0i1KXUO4

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The smallest muscles are found in the middle ear.
It takes 17 muscles to smile and 43 to frown.
The only muscle that never tires is our heart.

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https://www.youtube.com/watch?v=aboVLnsCH44

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There are more nerve cells in the human brain than there are stars in the Milky Way

There are 100 billion neurons in your brain alone

The left side of human brain controls the right side of the body and the right side of the brain controls the left side of the body

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https://vimeo.com/115780772

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The heart beats around 3 billion times in the averages person's life.
Within a tiny droplet of blood, there are some 5 million red blood cells.
Maintaining the balance of fluid in the blood versus the tissues (fluid homeostasis)

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https://www.youtube.com/watch?v=hc1YtXc_84A

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The right lung is slightly larger than the left.

Hairs in the nose help to clean the air we breathe as well as warming it.

The surface area of the lungs is roughly the same size as a tennis court.