Overview
Before there were machines, every product had to be done manually. Even handling of dangerous substances were done by humans without proper protection. This resulted in a lot of health problems but people didn't care because they were given jobs. So when the machines were introduced, millions of lives changed. This book will tell you what those changes were and how they affected the citizens. Enjoy reading!
- | Author: Baby Professor
- | Publisher: Baby Professor
- | Publication Date: Dec 01, 2017
- | Number of Pages: 64 pages
- | Language: English
- | Binding: Paperback/Juvenile Nonfiction
- | ISBN-10: 1541915380
- | ISBN-13: 9781541915381
