This thread on CO2 meters is among the more interesting things I've read this year. I'm not so interested in the comparison between meters (though do note that it's not worth the money to buy cheap meters). What's more interesting were the results observed in the testing process. Where levels of CO2 are high, as they are in poorly ventilated rooms with lots of people, we get sleepy. Oliver Quinlan writes on Mastodon, "I've definitely felt that classroom and conference sleepiness too. Also driving sleepiness." It might also help explain, I suspect, why we feel so much better and more productive working from home. Good edtech in this case might simply be an open window (though not in the U.K. just now) or better ventilation.
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