A group of about 1,000 people in the Netherlands caused a small earthquake that measured 1.2 on the Richter scale by jumping up and down at the same time. Seismologists with the weather bureau measured the strength of the quake. The seismologists say the earthquake caused “more than a ripple in a lake.” They were surprised at the earthquake’s strength, because previous similar experiments caused only tiny tremors.

It took more than a tiny earthquake to destroy one of the world’s most advanced civilizations.

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