What does it mean to look inside the very fabric of the universe?
This week on Inside Science, Tom Whipple enters the zeptoverse with particle physicist Harry Cliff, exploring a world a billion trillionth of a metre across, where scientists hope to find answers to some of the biggest mysteries in physics.
And in our new weekly series, we explore the changing relationship between artificial intelligence and the things we hold dear. This week, Stuart Manley, the co-owner of Barter Books in Alnwick describes why his bookshop has been receiving some rather unusual orders.
Plus, Penny Sarchet from the New Scientist joins us with the latest science news.
BBC Inside Science is produced in partnership with The Open University.
Presenter: Tom Whipple
Producers: Harrison Lewis, Katie Tomsett, Tabitha Taylor Buck
Editor: Martin Smith
Production Co-ordinators: Jana Bennett-Holesworth and Owain Llion