In a time when people believed flying was impossible, the Montgolfier brothers proved that the sky wasn't the limit. When most thought horseback was the only way to race, Bertha and Karl Benz fired up their engines. From the invention of the bicycle and the steam locomotive to the first liquid-fuel propelled rocket and industrial robot, this profusely illustrated collection of biographical portraits for readers 9 to 12 tells the story of the visionaries who changed how we travel.