Science Focus
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Something would definitely happen — but it wouldn't be a big something.
As mass moves towards the center of a rotating object, the rate of rotation increases. Imagine, for example, an ice skater pulling her limbs in to increase the speed of spinning. So, technically, you can make the Earth rotate more rapidly all on your own simply by crouching down on the ground — but at a totally negligible amount.
(More from Mental Floss: 11 notable people who shared their names with famous contemporaries)
Powerful earthquakes can redistribute mass in a slighter more impactful — but still...
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» see original post http://theweek.com/article/index/268186/what-would-happen-if-everyone-jumped-at-once
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