Thomas Edison was an American inventor and businessman. He developed many devices that greatly influenced life around the world, including the phonograph, the motion picture camera, and a long-lasting, practical electric light bulb. ... The light bulb also had wide-reaching social and economic consequences.Dec 8, 2014
George Washington Carver was a prominent American scientist and inventor in the early 1900s. Carver developed hundreds of products using the peanut, sweet potatoes and soybeans. He also was a champion of crop rotation and agricultural education.Dec 6, 2013
For example, the Olmec created a solar calendar. The Maya, using their knowledge of astronomy, and building on the Olmec solar calendar, created the most accurate calendar in the ancient world. ... Both the Olmec and the Maya invented many things, but they never used the wheel, and they never made metal weapons or tools.