Why Do Cameras Do This?

I once wrote about weird camera effects that touched on the rolling shutter phenomenon that makes weird stuff happen to images taken with video cameras. Now that panoramic photos are widely available on phones, you see them more and more often. Destin Sandlin of Smarter Every Day explains the rolling shutter effect and why it happens. Wait until you see what the effect does to a fidget spinner, a guitar, and a spinning coin! (via Everlasting Blort)