> why there is wide academic achievement difference between his children despite growing in the same environment
Why are there wide academic achievement differences between children who have the same "race" who grow up in the same environment? According to you, this should not be the case.
> how Japanese people could instantly guess I'm a foreigner while not uttering a single words
Do you think they can do so for any given person? I guarantee you there are foreign people who Japanese people don't guess are foreign, and non-foreign people who Japanese people guess are foreign. How can this be?
I can sympathize with your father getting angry. Considering how trivial it is to come up with counter arguments, it must be frustrating to have this brought up more than once.
Why are there wide academic achievement differences between children who have the same "race" who grow up in the same environment? According to you, this should not be the case.
> how Japanese people could instantly guess I'm a foreigner while not uttering a single words
Do you think they can do so for any given person? I guarantee you there are foreign people who Japanese people don't guess are foreign, and non-foreign people who Japanese people guess are foreign. How can this be?
I can sympathize with your father getting angry. Considering how trivial it is to come up with counter arguments, it must be frustrating to have this brought up more than once.