I took my kids into the doc's today for a checkup. While i'm waiting, I start fooling around with the pulse/ox meter that goes on your finger. With my mask on, my oxygen saturation was around 91 % and pulse around 90. Without it, oxygen around 96% and pulse around 82, which is closer to normal. From now on, I'll only be wearing them when I perform surgery. I'm a chef by trade.
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Like trying to keep out mosquitos with a chain link fence...
As as child I was out chasing fireflies at a schoolground as it was getting dark. The firefly passed right through. I did not. I careened face first into the fence. The fence made an impression.
Tellin sum Truth.