It's ____ well-known fact that ____ electric light was invented by Thomas Edison, but is it really true? Edison's light bulb, like many inventions, was ____ result of many scientists' work. ____ English scientist had made a simple electric light seventy years earlier and Edison's further development of ____ idea wouldn't have been possible without the work of his colleagues. Similarly, the Wright brothers are generally credited with inventing the first successful airplane at ____ beginning of the twentiesh century. Yet literally dozens of invetors and scientists before that time might claim to have taken key steps int developing ____ sustained flight. For instanse, a Norwegian named Navrestad supposedly flew in ____ glider in 1825 and, in subsequent years, ____ advances were made all over the world. In fact , just before the Wright brothers' famous flight, ____ American named Langley flew over ____ Potomac River, a distance of about 800 meters It seems that ____ person who not only achieves ____ particular feat but also records it , protects it and publicises it will be credited with the discovery.

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