 In fact, Einstein himself was puzzling over this for about 10 years. For about 10 years, when he was 16 years old to about the age of 26, he pondered this question about how can you go faster than the speed of light? And then he realized you can't, because every time you try to go faster than the speed of light, your brain slows down, and therefore you cannot measure it. Now, what does it feel like? That's the question that came in.