It takes more muscles to frown than it does to smile - around 43 grumpy muscles to 17 happy ones!

It takes more muscles to frown than it does to smile – around 43 grumpy

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Men’s hair is about twice as thick as women’s

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Your eyes start to develop just two weeks after conception

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Your teeth started growing six months before you were even born

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If the human eye was a digital camera, it would have 576 megapixels