" It is called THE REAL WORLD. The one based on science."
I wonder if you are one of the creationists or athiests on this board.
Anybody who is athiest should have no problem believing races would not be equal in everything. Since they would believe everything about everybody are no different than animals, it would equate to saying all breeds of dogs are equal in everything and or denying that dogs can be breed to be more aggressive or more playful, etc, depending on traits.
With cultures seperated by thousands+ of years, brains could develop differently, personality traits passed down, etc.
THAT is science.