How to build a time machine
b"We think of time travel as fiction, but there is nothing in the laws of physics that prevents us building a time machine. What's more, relativity provides practical opportunities to travel through time. Listen back to Brian Clegg, author of 'Dice World, Gravity, A Brief History of Infinity, Inflight Science and Build Your Own Time Machine', talking about the potential solutions to time travel from our recent public lecture."