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Glue

Glue is the product of hydrolysis of proteins, usually originating from animals. The waste products of slaughterhouses (hide clippings, hoofs[?], etc.) are the source of most commercial glues.

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Quadratic formula

... equation touches the x-axis in a single point.) If the discriminant is positive, then there are two different solutions x, both of which are real. (Geometrically, ...