For those of a certain vintage, no better day at school could be had than the days when the teacher decided to take it easy and put on a film. The familiar green-blue Bell+Howell 16mm projector in the ...

Do you know how a film projector works? We thought we did, but [Bill Hammack] made us think twice. We have covered the Engineer Guy’s incredibly informative videos many times in the past, and for good ...