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========== Hey, Vsauce. Michael here. And what if every
single person on Earth jumped at the exact same time? Could it cause an earthquake or
would we not even be able to tell? Well, first things first,
let's talk about the Earth's rotation. The Earth spins, that's why we have night
and day, and it spins quickly. At the equator, the Earth is spinning at more than 1,000 MPH. Now, a spinning ice skater can speed up by
moving mass closer to the center and the Earth is no different. In fact, if you get
down on the ground right now and move your mass closer to Earth's center, technically,
you will speed up Earth's rotation, making this day shorter. Now, the change that you would make to the
Earth's rotation is way smaller than we could even measure...