Few things capture the imagination like the thought of time travel. Many great works of fiction have been based on the concepts of changing the past, experiencing a distant future or the many paradoxes that exist in between. In episode 9 we chat with prodigious science writer, Brian Clegg, about his book, “How to Build a Time Machine: The Real Science of Time Travel”. How close are we getting? What barriers stand in our way? What is spaghettification and is it as bad as it sounds? All this and more in episode 9!