Whales, sex, and rocks — it's our holiday book show!

We talk to authors of some of this year’s most fascinating science books in our annual Holiday Book Show. INCLUDING: Questioning the purpose of whale song — for love or echolocation?Journeying through deep geological time to better tackle problems of the futureBiological sex is complicated but that's what helps animals like humans thriveMini reviews of: The Martians by David Baron, Dinner With King Tut by Sam Kean and The Mind Electric by Pria Anand.