Originally Posted by Gigs

It's not to be believed. If a How It's Made comes on in a field you are familiar with, you'll realize just how bad a lot of the information on that show is. It's still an entertaining show, but I wouldn't consider the narration reliable.

I think a lot of the time the crew interviews the people on the factory floor about a process instead of people that actually understand the science behind the process, because a lot of the mistakes made in the narration reflect the sort of understanding a factory worker with no scientific background might have.