Do the following thought experiment with me. Read this news article here. Then picture in your head what you imagine a 16 year old Iraqi with a penchant for mathematics and physics would look like.
In my head, I had a very clear image of this person, because at my undergraduate university, most of the civil engineering professors were Iraqi, and there was a large population of Iraqi students.
But I certainly did not expect him to look like this. It made me stop and reanalyze my own preconception I have of people. Especially foreign people.