I LOVE the Science Channel...I hate spending the extra for digital calbe, but Discovery Channel has devolved into largely junk TV as has the Learning Channel (though the latter is still more interestding than Discovery Channel).
My favourite nights are Mondays (Paleoworld) and Tuesday (Cosmic Connections)...and another nice thing is that they repeat the programming the next day until six so that if you missed something or want to see it again, you can)