S1E2: Haircut | Brain Freeze

S1E11: Love | Brain Freeze

Knowles and McCork ask, what happens when we fall in love?

S1E14: Why Is My Tongue Wet? | Nina and the Neurons

Corin asks Nina why tongues are wet, and with a few experiments they discover the reason.

S1E15: Digestion | Brain Freeze

Knowles and McCork explore the digestive system of Colin the floor manager.

S1E2: Do We All Smell Different? | Nina and the Neurons

Roddy wants to know if we all smell different.

S1E3: Amazing Maze | Nina and the Neurons

Nina travels to Spain to help Ella and her friends find their way through a maze using their different senses.

S1E6: Eyebrows | Nina and the Neurons

Nina helps Sam from Morecambe find out what eyebrows are for, and what eyebrows can tell us about what people are feeling.

S1E8: All Bunged Up | Nina and the Neurons

Lucy from Edinburgh wants to know why people cannot taste when they have a cold.

S1E9: Nina Needs A Wee | Nina and the Neurons

Nina goes to Spain to meet Jessica and to find out how we know when we need to use the toilet.

S2E1: Jumping | Brain Freeze

Knowles and McCork ask 'Which animal can jump the farthest?'

S2E11: Cats | Brain Freeze

Knowles and McCork ask 'Why do cats purr?'

S2E12: Eyesight | Brain Freeze

Knowles and McCork ask the question 'Which animal has the best eyesight?'

S2E13: Beards | Brain Freeze

Knowles and McCork find out why girls can't grow beards and what would happen if a man never shaved.

S2E14: Goldfish | Brain Freeze

Knowles and McCork ask if goldfish have bad memories and find out what makes them tick.

S2E15: Largest | Brain Freeze

Knowles and McCork ask what is the largest animal of all time?

S2E6: Venom | Brain Freeze

Knowles and McCork ask 'What is the world's most venomous animal?'

S3E1: Blood | Brain Freeze

Knowles and McCork ask the question 'How does my heart keep beating?'

S3E14: Taste | Brain Freeze

Knowles and McCork ask 'Why do we make saliva while we eat?'

S3E3: Invisible | Brain Freeze

Knowles and McCork ask the question 'Which animal can turn invisible?'

S3E5: Teeth | Brain Freeze

Knowles and McCork ask the question 'Why do we have baby teeth?'

10: Themes and Variations | Life On Earth

David Attenborough looks at some of the huge variety of mammals. The tree shrew has attracted great interest as it shows how mammal...