<div dir="ltr"><div class="gmail_default" style="font-family:comic sans ms,sans-serif;font-size:large;color:#000000"><span style="color:rgb(32,33,34);font-family:sans-serif;font-size:21px">(from Wikipedia)  .......was one of the basic </span><a href="https://en.wikipedia.org/wiki/Tool" title="Tool" style="text-decoration-line:none;color:rgb(51,102,204);background-image:none;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial;font-family:sans-serif;font-size:21px">tools</a><span style="color:rgb(32,33,34);font-family:sans-serif;font-size:21px"> used to create and spread modern </span><a href="https://en.wikipedia.org/wiki/Civilization" title="Civilization" style="text-decoration-line:none;color:rgb(51,102,204);background-image:none;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial;font-family:sans-serif;font-size:21px">civilization</a><span style="color:rgb(32,33,34);font-family:sans-serif;font-size:21px">, possibly as important as the </span><a href="https://en.wikipedia.org/wiki/Wheel" title="Wheel" style="text-decoration-line:none;color:rgb(51,102,204);background-image:none;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial;font-family:sans-serif;font-size:21px">wheel</a><span style="color:rgb(32,33,34);font-family:sans-serif;font-size:21px"> or </span><a href="https://en.wikipedia.org/wiki/Printing_press" title="Printing press" style="text-decoration-line:none;color:rgb(51,102,204);background-image:none;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial;font-family:sans-serif;font-size:21px">printing press</a><span style="color:rgb(32,33,34);font-family:sans-serif;font-size:21px">.</span><sup id="gmail-cite_ref-Baber_1996_4-1" class="gmail-reference" style="line-height:1;unicode-bidi:isolate;white-space:nowrap;font-size:16.8px;color:rgb(32,33,34);font-family:sans-serif"><a href="https://en.wikipedia.org/wiki/Stirrup#cite_note-Baber_1996-4" style="text-decoration-line:none;color:rgb(51,102,204);background:none">[4]</a></sup><br></div><div class="gmail_default" style="font-family:comic sans ms,sans-serif;font-size:large;color:#000000">scroll down for answer after not coming up with anything,like me  bill w</div><div class="gmail_default" style="font-family:comic sans ms,sans-serif;font-size:large;color:#000000"><br></div><div class="gmail_default" style="font-family:comic sans ms,sans-serif;font-size:large;color:#000000"><br></div><div class="gmail_default" style="font-family:comic sans ms,sans-serif;font-size:large;color:#000000"><br></div><div class="gmail_default" style="font-family:comic sans ms,sans-serif;font-size:large;color:#000000"><br></div><div class="gmail_default" style="font-family:comic sans ms,sans-serif;font-size:large;color:#000000"><br></div><div class="gmail_default" style="font-family:comic sans ms,sans-serif;font-size:large;color:#000000">the stirrup - enabled fighting from horseback</div></div>