Which of Dickinson's technical innovations does the author of "Reckless Genius" explore

Which is a higher ratio, 6: 9 or 3: 7

The greatest gift the sumerians gave the world was the invention of writing. the sumerians were wealthy people. they needed some way to keep track of what they owned. they began drawing pictures. they used a reed as a pen. they drew on soft pieces of clay. the soft clay was then dried in the sun. the tablet became a permanent record. later, the sumerian drawings changed into wedge-shaped symbols. this kind of writing is called cuneiform. by putting symbols together, the sumerians could write entire sentences.

What are the authors purposes in writing its our world too young people who are making a difference