Hey, man, I got to use the overhead projector, and I remember in college there was a professor who used it. And with two sheets of acetate and using the blackboard I could give a class of biochemistry understanding perfectly.
This way you explain how everyone works is very easily understood.
Thanks for sharing this information friend @rbalzan79
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Thank you my friend @josevas217 for commenting, that's how it is at that time that this instrument was the best for teaching. Nowadays a lot of progress has been made thanks to technology. Greetings.