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The ability to shape and join most of the hardest materials in common usage is the greatest advancement for the layman.
Personal note: I had a rotating rocker chair which had bad bearings. Couldn't find a replacement, manufacturer out of business. Bought a dinky-azz lazy susan bearing set from a big box store and fabricated a base and attachment. End result was a chair that matched a couch which matched the walls. Back in business for a few dollars in electricity and a few hours.
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