The Discovery Channel is good for quasi-educational entertainment. I just hate the goddamn ghost shows. And thetorical "Are UFOs Among Us?" shit. But I love quality junk food science. "Could 200 Confederate soldiers defeat Henry V?" "What happens when you put thermite on stuff", "Forensics: The Gruesome Detectives" etc.
The Discovery Channel is gradually turning into a middlebrow circus freakshow... "Step right up! See the two-headed girl! The morbidly obese man! A family of dwarves!"