We join Lyra, Will and the galivespians as they head back into the Himalayas to find Iorek and see if he can help them with their plan to fix the knife.

Join us as we make some of our worst noises yet, get tangled up with quantum physics and share some bizarre cures for whooping cough.

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Here are some fun facts about Encephalisation quotient (EQ) - the term Amy half-remembered for the ratio of brain size to body size.

Read more about Stradivarius and the European ‘Little Ice Age’ here!

This is the study about whale language structure which Amy refers to in this episode.

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Music by: Jaymen Persaud, performed by Claire Wickes

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