as far as I'm concerned, they should have a "car guy" channel. the only things I watch on Discovery is MythBusters and such rare episodes of Unsolved History as they air. (not enough.) I don't watch anything on TLC anymore (the first thing I ever watched there was Connections; now, I actively avoid the channel). and now, there's regular car shows on the History Channel.
while the car shows can, from a certain perspective, be called history or discovery or learning, none of them are really aired as such; they're all "hey, look, it's cars." I don't care. I'd really like to see a documentary about Henry Ford, but I don't want to see the engine of a Ford.
"Now everyone was giving her that kind of look UFOlogists get when they suddenly say, 'Hey, if you shade your eyes you can see it is just a flock of geese after all.'"
"You can't erase icing."
"I can't believe it doesn't work! I found it on the internet, man!"