What is some Skydiving history information?

What is the history of skydiving? when and whom was it created invented? how much has it changed? Describe the objects in motion. do the people move in a straight line or do they change direction? is a ball or other other object the focal point of the "game"? what two things must be measured to determined the average speed of an object? (*** or if you could please give me some great websites to go on and get information i can not use wikipedia****)