Thread: Mass. School Openings Requires Masks
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Old 06-28-2020, 08:14 AM  
celandina
Too lazy to set a custom title
 
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Join Date: Jun 2006
Posts: 11,227
This is a simple, but perfect explanation. The best and clearest I have ever seen....


https://youtu.be/GH88Y_090Xk
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