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Electromagnetism. Ferromagnetism

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Geology --- Géologie --- Periodicity --- Solar system --- Système solaire --- Solar system. --- Periodicity. --- Géologie --- Système solaire --- Geology - Periodicity.

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Math is a subject many people find intimidating. But many don't understand the history of math and how it came to be what it is today. Here, G. Arnell Williams illuminates, in plain and simple terms, how we got the math we use today, the math our children learn, and the math we struggle at times to explain.

Mathematics --- Arithmetic --- Set theory --- Calculators --- Numbers, Real --- Math --- Science --- Study and teaching (Early childhood) --- Parent participation.

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Welsh philology --- Scholars, Welsh. --- Study and teaching.