There is no history on the History channel. There's nothing true on TruTV. There's no music on music television. There's no science on the science channel.
History channel has Forged in Fire where, for about 30 seconds per episode, they give a quick lesson about the historic weapon the contestants will make.
I always appreciated that in shows like Pawn Stars and American Pickers, yeah the main point is entertainment, but they actually made an effort to explain the objects and history around them.