Mad is currently discussing the philosophy of physics in the Discworld and real universe. Actually that's not strictly true, she just mentioned it and us her readership unkindly turned it into a discussion.

But it reminds me; pTerry was on GMR, my parents local radio station. My Mum then declared an interest in trying one or two of his books, so I've lent her "The Truth" (an excellent story about the media in Ankh Morpork), and whatever she can find in my room in their house. Not sure what she'll make of it all as she's more a muder mystery reader (eg Patricia Cornwell, Sarah Paretsky), than a fantasy or satire reader.