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 future
• Biological sex is complicated but that's what helps animals like humans thrive
• Mini reviews of: The Martians by David Baron, Dinner With King Tut by Sam Kean and The Mind Electric by Pria Anand.