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Comment by kens

16 hours ago

That reminds me of the Popular Science garage hint from 1963, explaining how to easily dispose of used motor oil: Dig a hole in the ground and fill it with fine gravel. Pour in the oil, and it will be absorbed into the ground before your next oil change.

https://books.google.com/books?id=myADAAAAMBAJ&pg=PA166#v=on...