RT @MatthewWielicki: This is absurd. It’s 40k ppm in your and their lungs. It’s

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RT @MatthewWielicki: This is absurd. It’s 40k ppm in your and their lungs. It’s easily 600-800 ppm in a classroom during my lectures. It’s…

Source date (UTC): 2022-12-25 00:38:21 UTC

Original post: https://twitter.com/i/web/status/1606811549137616896

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