What was the stage name of Jean François Gravelet, a French acrobat who crossed Niagara Falls in 1859 on a tightrope 160 feet above the water?
French physicist and engineer Augustin-Jean Fresnel (1788 – 1827) contributed significantly to the establishment of what theory?
What was the name of the German fighter pilot known as the "Red Baron", officially credited with 80 confirmed air combat victories, who died in 1918, from wounds sustained in combat?