Speech Hello, my name is Jun Iwata and today I'd like to talk about Edison and his work to create the incandescent light bulb. Back ground. Before this invention, light was only fire. So sometimes it was dangerous. If there were in house, there made cause of fire. But the first incandescent light bulb's continuous lighting time was only 40 hours because the parts of the light, filament was not so strong. You have some background information on incandescent light bulb. Now let's look at the focus of Edison's research. Research Question. Find the good filament. Methods and Date In 1879, Edison conducted an experiment 1, He tried carbon. But it's not good. 2, He collect various items for filament. 3, He try about 2000 items. And in many case, it was failed. 4, The last, he find Japanease bamboo. It was very good for filament. it lighted 600 hours. Conclusions and Future Research Edison's work was success. But it was made by many failed. After this experiment, people got safety lights.