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Installing air filters in classrooms has surprisingly large educational benefits (2020)

(www.vox.com)
308 points tangjurine | 1 comments | 31 Mar 25 00:22 UTC | HN request time: 0.201s | source
1. throwaway81523 ◴[31 Mar 25 02:46 UTC] No.43530315[source]▶
From 2020.