This guy claims to be the only person that understands magnetism. For what its worth he is entertaining.
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I was a sysadmin in a shop that looked like a used parts store. We would cannibalize old server components that were going to be discarded and reassemble them into “Frankenstein” servers. However, the most fun we had was disassembling the hard drives for the rare earth magnets. You could take two of them and stick them on either side of your beefy hand. We made some pretty cool stick figures with them too. We had absolutely no problems hanging framed pictures on the metal walls...