div class=trans-pagebuttonPage 1button div class=trans-image amp-img class=trans-thumb alt=Page 1: standleyhistoryweeblycom · FACTS ABOUT O In 9th-century Baghdad three mathematicians—the Banu Musa brOtherS—invented ingenious trick devices and puzzles that were like the src=https:reader030fdocumentsinreader030viewer20220411235d230a5088c993d0068ce5e0html5thumbnails1jpg width=142 height=106 layout=responsive amp-img divdiv