A dutch data scientist repeatedly showed, with data that Covid was airborn and ventilation should be a top priority [0] (dutch). Unfortunately has was ridiculed. I wonder how much better we could have done taking these early warnings more serious. Part of me thinks we wanted an easy option (masks) instead of expensive changes to existing ventilation systems.

[0] https://pointer.kro-ncrv.nl/hoe-maurice-de-hond-in-het-coron...