Fun facts… Skin and skull

In my reading, I learned why the skin is dry even though the cells are dead. Our skin cells contains a protein, keratin which causes the skin to be dry, providing a waterproof barrier to outside elements from entering the body. Where as, in the lining of our mouth, the cells have a non-keratin protein which causes the lining to be wet.  
Now, studying the skull – the temporal bone (Greek or Latin reference/origin), temporal refers to time and aging. It is this area of our hair/head that first starts to show gray, which is a sign of the passing of time. Btw, gray is a US spelling and grey is a British spelling. 

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