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i think a physicist who has vast knowledge about cosmic rays knows what she is talking about...
...vast knowledge?

John, do you remember the thread you started last year, inspired from your physicist friend, who told you ....muons cause film fog?
Good!...
Then you should also remember when I said that muons arrive at sea level with an average flux of about 1 muon per square centimeter per minute - about half of the typical total natural radiation background.
So, your physicist friend vast knowledge about film fogging is still, worthlessly irrelevant.

