Magnet fishing is the coolest hobby you probably didn't know existed

Nope. Magnets, themselves, qualify as “cool swag”.

The coolest thing about this is that it directly cleans up waterways. Not much really ought to be overly magnetic or ferrous in the average stream or river, beyond magnetite and rare iron nodules…[quote=“middlewaytao, post:18, topic:102454, full:true”]
I haven’t watched the video yet, but an electromagnet is maybe an option.
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Yes, certainly, and they’re used for the exact same purpose and nearly the same way. Of course, that means you need power and cabling, as well, so w/e.