Personally, I'd probably choose the boring answer of something pertaining to my career such as math or I'd go for something like real-estate investment or day trading. Something to make me more money. But my fun answer would probably be music composition. Seems like a fun skill and something I'm not good at all.
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Edited by Pie: 7/12/2020 12:42:34 PMMetal fab. E: To explain why, skill I can throw at the automotive space. Healthy landing pad if automotive application doesn't play out.