Electric lights were only used by a few people. In 1879, Edison discovered that a carbon filament in an oxygen-free bulb glowed but did not burn up for 40 hours. Edison eventually produced a bulb that could glow for over 1500 hours. In 1903, Willis R. Whitney invented a treatment for the filament so that it wouldn't darken the inside of the bulb as it glowed. The incandescent bulb revolutionized the world.
Children can easily make log cabins and other structures from the tiny wooden logs.
John patented his toy in 1920, and sold the logs through his toy company, the Red Square Toy Company. Playskool bought the rights to Lincoln Logs in 1943. Nesmith was a secretary in Texas, USA, before the time of word processors. She began selling her vastly popular invention, and soon ran the very successful Liquid Paper company. Her son, Michael Nesmith, was a member of the rock group called the Monkeys.