We hear how a free online encyclopaedia, run by volunteers, became one of the internet's most popular sites.

Co-founder Jimmy Wales tells about the ideals which helped him build the site, and the challenges its now facing, from AI to political criticism.

Presenter: Chris Vallance Producers: Hannah Bewley and Niamh McDermott

(Image: Jimmy Wales photographed at Web Summit 2022 at the Altice Arena in Lisbon, Portugal. Credit: Getty Images)