This has poor audio. Please see the remastered version linked below. What happens when you go faster than light? Can you go faster than light? (well, no, but let's chat anyway). And how do we know that we can't go faster than light? Why does going faster than light mean traveling into the past? 0:00 Introduction 0:25 Faster than Lightspeed Travel 1:12 Too Bad.... 2:30 The Two Principles of Special Relativity 6:21 The Principle of Causality 11:09 Galilean Relativity in Sketch Form 16:30 Galilean Relativity: Speeds Add Together 18:02 Galilean Relativity: Do Speeds Add Together? 19:42 No Longer Galilean Relativity 25:10 The Invariability of the Spacetime Interval 29:40 A Bouncy Light Clock 38:55 Consequences of Special Relativity 39:53 What about Tachyons? 42:14 Tachyonic Anti-Telephone 49:17 Special Relativity Demands Causality 49:55 Time Dilation: Moving Clocks Run Slower.