I was driving along the other day, SMH at all the aluminum cans on the side of the road, thinking about my autonomous can collecting robot idea, when a thought occurred to me. There must be a veritable aluminum mine along all the ditches across the US. I'm not saying we should strip mine the top foot of the ditches. I just realized how much aluminum must be in the top soil of all the ditches of all the roads across America that has collected over the decades! Just something to think about.
UMR
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