There are many risks associated with new medicines and it isn’t always possible to get rid of all the risks. Professor Hallux and Nurse Nanobot find how scientists weigh up what’s acceptable.

Marina Ventura and The Micro-Gridders: The Super Squad
05:17

The Circular Trail: a free Time Hunters history walk around the City of London
46:10

Marina Ventura and The Micro-Gridders: The Power Stash
05:25