The key factor in Thomas Edison success is discovering the carbon cardboard as a suitable element for his filament. This was the last and the most important thing in Edison design of the light bulb. Edison decided to use carbon filament after much testing because he discovered that the carbon filament will glow without burning. Because of Edison invention, electricity light becomes a possibility and it is used for many things both in the homes and in the industries.
The main thing that the AEF, doughboys, and harlem hellfighters (369th regiment), have all in common is that they were part of the "American Expeditionary Forces," who were sent to Europe in 1917.
