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Ventilation

A Boston ringing room isn't necessarily the same as a Swiss classroom, and 
I know we're on Team Ventilation already, but I thought this was 
interesting. 

[ 
https://www.swissinfo.ch/eng/society/study-shows-benefit-of-regular-classroom-ventilation/47179498
 | 
https://www.swissinfo.ch/eng/society/study-shows-benefit-of-regular-classroom-ventilation/47179498
 ] 

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