Encyclopedia > 5th millennium BC

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5th millennium BC

(6th millennium BC - 5th millennium BC - 4th millennium BC or 40th century BC - other millennia)


Events:

Significant persons:

Inventions, Discoveries, Introductions



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Dynabee

... pushes against the lower rim of the groove. While the axis is slipping around inside the groove, the friction between the axis and the groove rims will accelerate or brake ...

 
 
 
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