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Marc Bonfils

Marc Bonfils was a French ecologist and grain farmer. He developed a method of no-till farming[?] in part based around bio-dynamic[?] principles.

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Quadratic formula

... the method of completing the square[?]. <math>ax^2+bx+c=0</math> Dividing our quadratic equation by a, we have <math> x^2 + \left( \frac{b}{a} ...