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Universalpsykopath tugs our coat and says: Tell us about your feats of deduction and the little mysteries you've solved. Alternatively, tell us about the simple, everyday things that mystified you for far too long.

(, Thu 13 Oct 2011, 12:52)
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The correlation of electron spins in an object.
An object with randomly aligned electrons will have no net magnetic field.
Once the electron spins line up, this induces a magnetic field gradient.
In some materials - permanent magnets - the changes in spin induced by a strong internal field does not decay.

Both thermal effects and external fields can demagnetise magnets - due to overcoming the potential energy stored in the magnet, and randomising the spins.
(, Fri 14 Oct 2011, 18:04, 1 reply)
Saying magic would have been quicker.

(, Fri 14 Oct 2011, 19:06, closed)
And made more sense.

(, Sun 16 Oct 2011, 21:07, closed)
but
be no use at all if you wanted to do anything clever with magnetism.
(, Mon 17 Oct 2011, 22:40, closed)

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