No time for ads? Find out moreStream 1500 shows without ads. Find out more
Series 3 Episode 5

Highly gifted children aged between 7 to 12 take part in a competition, run in association with British Mensa, to find the UK's annual child genius

It's the Child Genius final and the remaining five gifted youngsters take on the specialist subject round, including the curvature of space time and a history of cryptography

Twenty of the country's cleverest kids compete to be crowned the brightest, in 2015