Dr Karl and guest host Ash McGregor discuss various fascinating topics, including itch and pain, moon mining's impact on Earth, the relationship between strength, muscle mass, and energy expenditure in weightlifting, and the incredible tracking abilities of sniffer dogs.

Dr Karl and science writer Zoe Kean discuss health food scams, emu wars, the truth about drinking hot lemon water, religion's influence on evolution, and can turtles hear rain. Zoe shares insights about her upcoming book on evolution, ecology, and environment.