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This video explains it very clearly. It helps me understand.

Very educational Professor. Keep 'em coming 👌👍

I remember a certain party I went to and they were messing with the ceiling fan and a strobe light. It was the kind of party that made this the most phenomenal thing you ever saw.

Excellent video and perfect timing. I was trying to explain how a timing light can be used to set ignition timing of most internal combustion engine. You explained it way better than I did!! Thanks for the video.

The most likely reason that wagon wheels turn backward in old movies is editing matches the old projection or camera frame rate with the current frame rate. The process is pretty simple. Just make an array of how different every frame is from its neighbor. This index should give you a starting place to choose images to duplicate or decimate. The sum of two pages xored together pixel by pixel is where I would start. I believe that can be scripted in ImageJ. The difference may also work. I chose XOR because it's uniformly fast(1 machine cycle) on all platforms. A strobe light is great for timing and calibrating things for time. All you need is a ruler, a weight, and a way to drop the weight so it appears in the picture along with the subject illuminated by the strobe twice. A falling weight in front of a ruler allows anyone to calculate time inerval in a KZfaq video. We used them for almost everything. If its an old one it may have an external trigger that can be set up to catch events such as gunshots.

The first time I heard about the danger to someone caused by a flashing (red) light was in the movie "The Andromeda Strain".

Fantastic explanation, but u could have used a little more technical terms