Iron which is brought near a spiral of copper wire, traversed by an electrical current, becomes magnetic, and then attracts other pieces of iron, or a suitably placed steel magnet.

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• Hermann von Helmholtz:

  Not that I wish by any means to deny, that the mental life of individuals and peoples is also in co

• Hermann von Helmholtz:

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  I was born on August 10, 1913, in Lorenzkirch, a small village in Saxony, as the fourth child of Th

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