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https://twitter.com/yadav_monica/status/1292047281676382210 https://twitter.com/yadav_monica/status/1292047281676382210 is another instance where a teacher from
by psankar 6y ago
https://twitter.com/yadav_monica/status/1292047281676382210 https://twitter.com/yadav_monica/status/1292047281676382210 is another instance where a teacher from India used a smartphone and a refrigerator tray for sharing hand-written notes. I believe that this would give more clarity than the surface area of the CD.