TIL that Saturn's moon Titan is the only moon known to have a dense atmosphere and the only known moon or planet other than Earth on which clear evidence of stable water-like liquids has been found
TIL David Letterman fought to get Norm Macdonald the "Late Late Show" on CBS, which went to Craig Kilborn (topic @ 22:23)
TIL Steven Spielberg used dungeons and dragons to test the compatibility between cast members in E.T. The original Eliot didn't get the part because the other kids didn't like him.
TIL that face mites live in our facial pores, have eight legs like a spider, eat sebum (skin oil), and don't have anuses.
TIL that Norm Macdonald's famous 'Moth Joke' was mostly improvised on the spot when he realised he had been booked for an additional segment on Conan for which he had not prepared, turning an old classic 20 second joke into a long drawn out domestic moth tragedy to fill the time.