It is the bamboo.
And it was bamboo which Mr. Edison chose.
Oh, how glad this light made many people!
In ten cotton factories in one town were men, women, and children working.
They worked in rooms where gas was used.
The gas injured their eyes and health.
Now in those same factories there are sixty thousand electric lights.
The bamboo burns six hundred hours before it has to be replaced.
Would you like a picture of Mr. Edison?
Close your eyes then and think of him like this.