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Terrella

The terrella, or little earth, was an invention of William Gilbert in the 16th century. Ground from a lodestone, it simulated the magnetic dip of the Earth.



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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} ...

 
 
 
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