Edison often said, "1 will discover what the world needs, then I will try to invent it."  It is true that he did more than any other man of his time in inventing things. He made more than one thousand inventions in his life and all these have changed our way of living. Edison was one of the greatest inventors in the world. When Edison died in 1931, someone said people should turn off all the lights in their homes, streets and factories for several minutes in honor of this great man. Of course it was impossible to do so. And this shows what Edison's inventions mean to people's life. Edison had   _   inventions in all his life.
thousands of over one thousand only one thousand less than a thousand