People Used To Have Just One Eye Color

Your body is wonderland - do you know this phrase? Actually, it is true about everyone's body: it's such a unique and fascinating place, that scientists can't help but get amazed each time they discover something new. Yet, a lot about our bodies remains a mystery to us. 

For example, did you know that we, humans, have 3D vision! One might wonder, what we need those 3 D games for. Also, our tongue prints are as unique as fingerprints. And long ago all people had only one eye color - brown. Every eye color that appeared later was a result of genetic mutation. 

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