[ExI] surprise invention

William Flynn Wallace foozler83 at gmail.com
Thu Jan 26 16:13:24 UTC 2023

(from Wikipedia)  .......was one of the basic tools
<https://en.wikipedia.org/wiki/Tool> used to create and spread modern
civilization <https://en.wikipedia.org/wiki/Civilization>, possibly as
important as the wheel <https://en.wikipedia.org/wiki/Wheel> or printing
press <https://en.wikipedia.org/wiki/Printing_press>.[4]
scroll down for answer after not coming up with anything,like me  bill w

the stirrup - enabled fighting from horseback
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