RT @DrEricDing: 💡Behold—homemade 100 Corsi-Rosenthal air filter boxes!
📍100 x 30 students/class = 3,000 students who will have another lay…
RT @DrEricDing: 💡Behold—homemade 100 Corsi-Rosenthal air filter boxes!
📍100 x 30 students/class = 3,000 students who will have another lay…