For me I really do enjoy watching some of the Locking picking lawyers content and he is an expert when it comes to picking locks!
Another few are mental outlaw (although I think everyone knows of him here) and Steven Bridges who makes videos on card counting at casinos and he shows how much he wins/loses from playing
Cutting Edge Engineering is one of my favorites. Basically an Aussie couple that runs a machine shop where they do very large repairs on parts for heavy equipment. Loads of lathes, milling, boring, welding, all explained and filmed perfectly.
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Cutting Edge Engineering
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