Have you ever wanted to time travel? Modern physics shows that it's possible to manipulate time. But does that mean we can travel to the past? And what does this say about what time actually is? The last word often comes from physicists, but there are many definitions of time. Guests: sci-fi writer Ted Chiang (17:16), physicist Ron Mallet (9:02), and philosopher Heather Dyke (3:00). Part 2 of 6. Hosted by Rebecca Asoulin and Eoin O'Carroll. Visit csmonitor.com/time for the full transcript, episode art, and links to books and stories mentioned in this episode.