The correct answer to this open question is the following.
Although you did not include any information on chapter 9, and we do not know it, we can help you with the following comments.
One innovative idea that had the biggest impact on how people lived is without a doubt, the discovery of electricity.
Let's put it in simple terms, without electricity there would be no television, no light, no computers.
In the 17th century, English scientist William Gilbert set the foundation to study electricity and magnetism. Another English scientist, Thomas Brown, followed the steps of Gilbert and wrote many essays on electricity. And yes, of course, in 1742, founding father Benjamin Franklin conducted his experiment of static electricity with the use of his famous kite.