What was the key factor in Thomas Edison's success with the light bulb?

1880 liberty head silver dollar? What freedoms were english colonists looking for in america? What is Abraham Lincoln's nickname? What did the olmec accomplish in art and learning? The largest river in Africa? What is the value of a 1776-1976 tea cart made in 1976 worth has a egale with 1776on one side and 1976 on the other side on the bottom of the egale? Where did the hatfields and mccoys feud take place? Who was the first black woman to go to the moon? The American Expeditionary Force AEF was the name given to the US military who fought in this war? Caddeos tribe location? Some uses for Railroads and Railways? How did Lincoln's death affect the nation? What was the 36th state admitted to America? According to the treaty that ended Spanish-American War the U.S. Would? What factors attracted settlers to the great plains? Which was a primary means of christianizing the native Americans in the spanish clonies? What is the value of a 1792 buffalo nickel? What is the value of a 1917 1 dollar United States Note? When did the pilgrims settle in Plymouth? What was Arizona like in the 1900's?