What Would You Do if You Could Travel Back in Time?

We've got another voice message. This time it's from david from columbia. He refers to an episode we did recently about going back in time, travelling back in time and changing something. Do you remember where they spoke? We both agreed that maybe hitler would be something we liked to ange if we had to change a historical event. So i think that's the episode that David is referring to. Let's listen to his message.