I bet that around three hundred years ago, you would have been pretty annoyed with having to do your work with a candle. Well, we don't seem to have that problem anymore, thanks to Mr. Edisson who must have thought that working without a light bulb would be difficult. Necessity is the mother of inventions is a true statement. This means that working without a light bulb Edisson must have had some trouble so he sat down and thought about making a light bulb. Another way of explaining this statement is that when one is in need of something he or she would trhink about solving it. I think that this statement is true.
Image found at