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Thanks. :) Very clear explanation. Russian seems to have no standard way of expressing the concept, that's why I wondered.

Wow, that's a lot of information. Thank you very much. :)

Thanks. So it appears to be more similar than I thought... It`s just that in American schools this separations starts a bit later.

Ok, this is more of a cultural thing, but... What exactly a "science teacher" does in an American school? Do they teach some kind of "general science" class with physics, chemistry, etc. all lumped...