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RE: Simple Engineering: A Centrifuge and a Microscope for less than $3!
Elbow grease just means human-powered. Like, if you are scrubbing pots and pans and there is burnt on food, someone will say "put some elbow grease into it," like, "scrub harder." ;)
Is that where the expression "more grease preferably power now) to your elbow" spring from? That's nice. Thank you.
Oh, I haven't heard that expression, but probably!