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Series 18

The Guiding Hound

How do guide dogs know where they're going?

• 39 mins

Series 18

The Weirdness of Water Part 1/2

Please explain the weirdness of water? Drs Rutherford and Fry investigate.

• 37 mins

Series 18

The Weirdness of Water Part 2/2

Adam Rutherford and Hannah Fry attempt to answer more questions on why water is weird

• 40 mins

Series 18

The Painless Heart

Why does my heart not ache after exercise? Drs Rutherford and Fry investigate

• 37 mins

Series 18

The Slippery Situation

'What is the most slippy thing in the world?' asks 8 year old Evelyn from London

• 37 mins

Series 18

The Venomous Vendetta

Will a venomous snake die if it bites itself? asks Janni in Amsterdam

• 42 mins