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A simple filter built from four furnace-type filters and a box fan can take the coronavirus and other pollutants out of the air, and can be used as a school project. They cost about $65 each and are being distributed to schools.

District of columbiaUnited statesThe white houseWhite houseDouglas bruggeCarson kehmnaVitalik buterinMary lafountainKristina wagstromFayekah faye assanahBalvi foundationNoah webster microsociety magnet school in hartfordUconn healthDepartment of public health sciencesUconn health centerJoe biden office of science