Although I didn't find the video very interesting, the topic of understanding these technologies can be helpful. There is a great book (re)publishing company that prints old machine shop manuals and has a few interesting books of their own. They cover everything from do-it-yourself forges and making a metal shop from scrap to glass making, alcohol stills, steam engines, and photography.
http://www.lindsaybks.com
I'm thinking of all the glass, plastic, and metal dumped in the parks where I
live and wondering how practical it might be to recycle it myself as a hobby.
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