As in, we have white skin, some people have darker/browner skin?
DS has never raised the question before but his language has improved a lot, his school class has a very diverse range of ethnic backgrounds and his best school buddy is (I assume) of Indian descent. DS was reading some words to me tonight and one of them was "tan" with a picture of someone who had obviously been in the sun too long. I don't want him to go to school on Monday and asked his friend if he had been in the sun too long!
So how did you explain (in very simple terms) the differences in physical features between ethnicities?