hello,boys and grils,my name is XXX,i'm on duty tody. I want to tell you something about inventions. We study everyday.when we study at night,we need use light.everybody knows that the light was invented by Edison.but do you know when was it invented?It was invented in 1879.Edison invented light.although he had failed,but he always work hard,at last,he succeed.we can learn that we should work hard in our life.ok.thats all,and i wish everyone will have a great day!thanks!