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On the border between england and wales people are obliged to wear a mask on one side and can leave them off a step away on the other side. At first people who chose to use them were made to feel foolish by the media non-experts now people are making up their own minds and flouting rules in such numbers they couldn't police it any more. Seems the virus can hop around without a passport Thing is though when the rate is high in one area of high density we may reasonably think 1 in 1/2 thousand risk is quite high so worth weighing up whether to use the horrible things - or not.

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How many physicists work for the CDC? That will tell you all you need to know about the CDC's competence to evaluate masking.

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