This week, I'm joined by Dr. Arik Kershenbaum, zoologist and astrobiologist at Girton College, University of Cambridge for a fascinating discussion about alien life and what we can learn about it from life on Earth.

• Dr. Arik Kershenbaum at the University of Cambridge
• Dr. Arik Kershenbaum on Twitter
• The Zoologist's Guide to the Galaxy by Dr. Arik Kershenbaum