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It’s amazing the things that you remember from school. About 35 years ago I leant that there is a thing in physics called Avagadro’s number and have never needed to refer to it since….something or other about space moles. I was just playing on a trivia site and a question came up about it and god knows why I was still able to recall that it is 6.02 x10 to the 23rd, but I can’t remember where I put my keys when I got home last night!

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