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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

... are complex numbers. The two solutions are complex conjugates of each other. (In this case, the parabola does not intersect the x-axis at all.) Note that when computing ...