A healthy (non-colorblind) human eye can distinguish between 500 shades of gray.

A healthy (non-colorblind) human eye can distinguish between 500 shades

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Astigmatism refers to a curvature of the cornea or lens and toric lenses

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The cornea is the only tissue in the human body that doesn’t contain

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When you swallow, your food travels down your oesophagus to your stomach

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The large intestine is actually shorter than the small intestine –

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In your lifetime you will produce around 10,000 gallons of saliva