Misc: On Three's Company,what is the name "Chrissy" is short for??

Questions

Jacob Fussell, Baltimore dairyman, sets up 1st ice-cream factory.?

Celluloid patented by John Wesley Hyatt, Albany, NY.?

1st attempt at motion pictures (used 12 cameras, each taking 1 picture) done to see if all 4 of a horse's hooves leave the ground.?

Ford Motor Company manufactures its 10 millionth automobile.?

French fortress of Verdun captured by Germans.?