They are among history's most revered black inventors, known for their relentless inquisition, passionate research, impeccable design and, most importantly, their desire to push the envelope. Some of the world's greatest technological and social advancements, including the modern-day gas mask, light bulb and traffic light, owe their origins to black inventors. Did you know that George Washington Carver developed more than 100 products using peanuts? Or that Madam C.J. Walker was the first American woman to become a self-made millionaire? Learn more about these inventors, as well as Lonnie G. Johnson, Garrett Morgan, Patricia Bath, Percy Julian and more, at Biography.com.