Many of you have already seen the gorgeous video below: it’s a spectacularly beautiful animation of the activity in a cell.
I like it, and it’s a useful illustration, but … there’s something fundamental that it gets completely wrong. So today I’m not going to praise it, I’m going to criticize it. It’s a substantial criticism, too, one that means I wouldn’t show this video in my classes without spending more time explaining the error than it takes to show it.



