The human eye can function at 100% at any given moment, without needing to rest.

The human eye can function at 100% at any given moment, without needing

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Although it only accounts for around 2% of the body’s mass, the human

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Eyes began to develop 550 million years ago. The simplest eyes were

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The first blue-eyed person is said to have lived 6,000-10,000 years ago

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The human eye only sees three colours: red, blue and green. All other

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Even the tiniest of noises automatically makes your pupils change focus

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Your skin accounts for an amazing twelve percent of your body weight