It takes about one minute for a single red blood cell to travel around your entire body.

It takes about one minute for a single red blood cell to travel around

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The human eye can see 500 shades of grey

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The human eye can differentiate approximately 10 million different

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Your eyes are about 1 inch across and weigh about 0.25 ounce

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Although it processes sensations from all other parts of the body, your

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The cells in your eye come in different shapes. Rod-shaped cells allow

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Eyes are made up of over 2 million working parts