Knowledge: Tattoos have become a common form of self expression throughout the whole world except in certain cultures where body art is frowned upon. In Africa, black hair is the most prevalent.

Conversation:
I have brown hair that's so light that when you look at it under certain types of light, it looks blonde!
Interesting, do people mention how that's the second most common hair color?
I haven't but I don't quite like brown. Where is it most common in so I avoid them lol I want to stick out!
Well, the places that brown hair is quite common would be places such as Europe and Middle East, the US, and some Greater Middle East populations to name a few spots.
That's pretty much the whole world. Where is brown hair less common?

Response: The predominant hair color in Africa is black.