Your Hair's Black and His Blonde. Why?

You Indian.. your hair color's black.. yet your friend in the US has a blonde hair color..

Wondering why! Pretty simple! Again those radiations! 

 See that "Black is a good Absorber as well as Radiator of Heat". So in tropical hot countries like India where the average temperature of the year is around 32˚C. So a lot of heat falls on the head while a person is out in the sun. But the head (the brain) doesn't warm up so easily. The black hair absorb the heat and radiate it quickly. So the head is not heated much but the hairs are found warmed. There lies the necessity of having black hair. While in cold countries the necessity is less as the temperature is comparatively low. So Blonde or White!