I stumbled on Listopia by accident, and even with my only listening for an hour it was still on my mind a month later so I made time to listen again. I wasn't disappointed. Considering we're bombarded with information from a million different sources, and I didn't promptly forget about this show says a whole lot, to me.
I only just started listening, but I'm already convinced it deserves a great rating in part because I feel as if I'm listening to like minded friends discussing unusual, interesting, and important topics.
As someone else said, this show is not dumbed down, the hosts ask their guests intelligent, thoughtful questions, and don't crack stupid jokes, but they have a sense of humor. Also, each host has a unique personality, and background so that between everyone on the show all questions on one's own mind are talked about.
Listening to Listopia is not a waste of precious time.