

I’m not saying the physical traits you are talking about aren’t real. I’m saying you’re using the wrong word to describe them. Biologically there is no such thing as different human races. You are talking about ethnic groups.
If you take two people from an African country they can be genetically closer to an European or Asian person than to each other.

It’s called “Theory of Mind”. It’s basically the concept of understanding that other people know things that you don’t and it starts when children are around the age of three. VSauce talked about it in one of is videos. It’s incredibly interesting: https://youtu.be/evQsOFQju08?t=5m50s