December 31, 1879 – #ThisDayInHistory: Thomas Edison makes the first public demonstration of his incandescent light bulb. Edison did not invent the first electric light bulb, but instead modified the existing design to make the light bulb more commercially practical. Edison and his team tested more than 1,600 materials before finding the right one for the light bulb. Edison’s persistence changed the world and lit the way for all future generations. #ProgressIsPossible
