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What will happen, if all 7,000,000,000 people on earth simultaneously jump up and down?
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If everyone jumps at home, nothing significant will happen.
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That is - nothing at all.
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Even if we jump up and down the whole day long.
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But, if we were to collect all people of the earth in one place, we could very quickly solve a rather important problem: Overpopulation.
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Probably you have heard something about us humans multiplying our numbers much too quickly.
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There are just too many of us on earth.
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If nothing is done, soon there won't be any food left.
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One way of looking at it, 7,000,000,000 is not so much,
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so all the people on earth could easily fit into a territory equal to the size of Moscow or Los Angeles, for example.
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And it wouldn't even be crowded.
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OK, let's say we all gather on a hypothetical huge platform one meter of the ground and are ready to make this collective jump.
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What will happen?
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This jump will create a truly significant amount of energy, part of which will return back to each person through their shoes.
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And, some of which will dissipate into the environment with very interesting consequences.
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First, you will hear a very loud sound of about 200 decibels, similar to the sound of applause, only much much louder.
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A jet engine emits a sound volume of 140 decibels.
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160 is the level of a shock wave from a supersonic aircraft.
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The pain threshold of a human being is already passed at a level of a mere 130 decibels.
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135 to 140 decibels is a concussion.
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150 shock and severe injuries and 200 decibels - at best such a sound will simply blow your eardrums.
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That's at best, but basically, everyone will just die.
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Suppose you're only deaf after the jump.
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Somehow, you survived.
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You are incredibly lucky, but not for very long.
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It turns out that our jump strongly impacted the planet and in response to this degradation the earth will send a 30 meter high tsunami rolling back onto shore.
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Along with a couple of earthquakes of around 4 to 8 on the Richter scale.
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As a consequence, bridges, railways, powerlines and some buildings will be destroyed.
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The apocalypse is here.
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But, I must confess to you nothing will happen.
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I misled you.
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If we were able to bring together 7 billion people and make them jump at the same time, everything would be like this:
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