Arrow keys to switch between slides! This part spans from the rise of the Sumerian Civilization during 4000 BCE to the 9th century CE when zero was conceived.
Image Credits: sumerianshakespeare.com ancient-code.com computerhistory.org ushistory.org ancient.eu dandwiki.com telegraph.co.uk wisegeek.com Sources: https://www.youtube.com/watch?v=3U8i_dSMz78&list=PL0ML7CQ2Aozi2jt0lIxaCqCgKY7y7Foq3&index=7 https://www.youtube.com/watch?v=PSsa5-qpZto&index=3&list=PLtjnAzidCJb5GuyPWs4SKxuDvlHiNraFS
