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Nuclear family

A nuclear family, as opposed to extended family, is a kind of family with two parents and their children, it is typical in societies where people must be relatively mobile -- such as small hunter-gatherer societies and large industrial societies.

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Quadratic formula

... explicit solution(s) x to the quadratic equation <math>ax^2+bx+c=0</math> in terms of the coefficients a, b and c, which are assumed to be real (but s ...