Most of us know how to work a camera. But, it can be a lot trickier to know how a camera actually works. This video from the Slo-Mo Guys gives a nice insight into what's happening when you take a picture or shoot a video.
I won't go on for too long here in terms of text because it's a 7-minute video and you're better off just watching the darn thing, but once you're done just remember how complex the machines we use every day really are. Amazing.