Have you ever noticed that vacation days go by twice as fast as workdays? Well, maybe that’s precisely what’s happening. The Earth doesn’t spin on its axis once in exactly twenty-four hours as we used to think. In fact, its rotation speed can change. On July the nineteenth, twenty twenty scientists recorded the shortest day in history. It was almost a millisecond and a half shorter than usual. Moreover, researchers believe that the Earth's rotation rate will continue to increase. But how fast? Four and a half billion years ago, the day on our planet lasted for just four hours. What if Earth starts spinning so fast again? In this video, you’ll find out: can raindrops fall in the opposite direction? How to reach zero gravity on our planet? And what will happen to us if Earth starts spinning at the speed of light?