If you want to spend time on youtube...
"Smarter Every Day" is a fun series of videos about science and engineering and cool stuff (e.g.Tesla coil gun. Does the arrow fly farther when you hold the draw for a moment first? What does a Prince Rupert's Drop look like as it shatters, and why?
I ran across Lindybeige: a reinactor talking about medieval arms and armor and other topics. He speaks both from research and experience with reinacted battles. He's interesting and plausible, though when he leaves his field of expertise and starts talking about (e.g.) holographic tank optics, you get nonsense. His experience is in reinacting battles, and not in urban combat and enforcement. A couple of weapons he deprecated look like they'd be more useful in narrow alleys with nobody beside you than in battle array with buddies around.
And, of course, auto repair videos. I've been watching a bunch of them lately. I'm still not quite sure how they got one piece to come loose so easily; I can't get it to budge.
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