This episode of the Physics World Weekly podcast features an interview with Charalampos (Harry) Tsoumpas at the University of Leeds, who explains why the development of ultrafast gamma-ray detectors could be a boon for medical imaging.

Also appearing this week is the soft-matter physicist Carmen Lee at McMaster University, who talks about an online programme called Ask A Scientist that answers questions about physics from school children who are learning at home. Lee also chats about her research into the Cheerios effect.