Final answer:
The Wright brothers made over 1,000 glider attempts from the slopes of Kitty Hawk sand dune in 1902, using them to confirm that they could properly control their aircraft.
Step-by-step explanation:
The Wright brothers made over 1,000 glider attempts from the slopes of Kitty Hawk sand dune in 1902. They used these glider flights to confirm that they could properly control the aircraft before they proceeded with powered flight experiments. Their work at Kitty Hawk was a crucial step in their journey towards achieving the first powered flight.