During a sight test, health conditions including diabetes and high blood pressure can be detected.

During a sight test, health conditions including diabetes and high blood

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Human Body Facts

When you blink, it lasts for about one tenth of a second

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The human eye can see 500 shades of grey

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On average, you will blink approximately 4,200,000 times in a single

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In an experiment, people were given glasses which flipped their vision

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While it takes some time for most parts of your body to warm up to their

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Your eyes can detect a candle flame 1.7 miles away