The Invention of the Equals Sign

http://www.wired.com/wp-content/uploads/2014/10/15210340981_8e7c06a027_b-660x473.jpg The Invention of the Equals Sign

http://www.wired.com/wp-content/uploads/2014/10/15210340981_8e7c06a027_b-660x473.jpg
The Invention of the Equals Sign