The last 250 years have brought many new things to our world. We went from walking, to riding a bike, to driving a car, to flying in airplanes, to launching lunar rockets. We went from sending mail, to talking on the phone, to text messages, to computer videos. Inventors spent hours - even years - testing their ideas amid failure and ridicule before they found the success we enjoy today. This book will take you on a journey through the last 250 years, highlighting twenty of these key inventions that had a significant impact on history.