We've got the Joy of Mathmatics out from the library right now. DS is loving it, and is pointing out that many of the topics are covered in Number Devil. I took discrete math and linear algebra from that guy! Also, if you like his style, look for his TED talks.
DD has enjoyed the Cosmos one (Tyson), and like ColinsMum, we returned an Earth one, but due to sheer boredom. I didn't watch enough to see errors of physics. I'm surprised, though, because both guys that do the earth sci sets know their stuff. We also really enjoyed one on the Renaissance, though right now I can't think exactly which one.
Not the question, but I have noted in the past how few women are represented in the Great Courses lectures, they are lecturers at a rate far below national averages in professorships in the US.
