Thomas Edison's lengthy to-do list called for phonographic clocks and ink for the blind

Thomas Edison may not be everyone's favorite inventor, but it's hard to argue that he wasn't always working, trying to figure out what the next engineering innovations would be. These excerpts from a 1888 to-do list offer some insight into Edison's ideas for the next big thing. » 6/03/12 10:15am 6/03/12 10:15am