Because that's been done and there are plenty -- your hard drive probably contai... | Hacker News

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		_0nac on Aug 13, 2015 \| parent \| context \| favorite \| on: Ferrolic Because that's been done and there are plenty -- your hard drive probably contains some! https://en.wikipedia.org/wiki/Ferrofluid#Applications

bro-stick on Aug 13, 2015 [–]

Passive cooling of a speaker's voice coil is pretty neat.

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