Do you wonder that he is called "The Wizard of Menlo Park?"
But his crowning discovery is the electric light.
Some gentlemen of New York put one hundred thousand dollars into Mr. Edison's hands.
They told him to experiment until he could make a light which every one would be glad to use.
Many had tried to do this and had not succeeded.
It is said that he tried two thousand substances for the arch in his glass globe before he found one which suited him.
Do you know what he chose at last?
Do you remember the plant which the boys and girls of India, China, and Japan know so well?