Ask anyone about the history of aviation, and they will tell you exactly how it all began.
In December 1903, the Wright Brothers took their wood and fabric biplane to the sand dunes of Kitty Hawk, North Carolina.
Their historic flight - the first by a powered and manned aircraft - lasted just 12 seconds and covered no more than 120 feet (37 metres).
But it was the realisation of a centuries-old dream, and it was to change the world.
Orville and Wilbur Wright secured their place in the history books, and this year, their remarkable achievement is being celebrated at centenary events in the United States and around the world.
But who now remembers Sir George Cayley?
Very few in Britain, it seems, even though this remarkable inventor paved the way for the Wright Brothers and all the aviators who followed.
If it had not been for Sir George's pioneering work, the Wright brothers may not have got off the ground.
Cayley is the man described by aviation experts as the father of aeronautics.
He designed his first aircraft as long ago as 1799, and by the middle of the 19th Century, he was building and flying gliders.
A small boy was the first passenger.
But Cayley realised that only a flight with a grown man would demonstrate the potential of his strange-looking aircraft.
So in 1853, Sir George's coachman was ordered to take to the skies at Brompton-by-Sawdon, near Scarborough.
After his alarming experience of air travel, a shocked John Appleby faced his employer.
"Please, Sir George, I wish to give notice," he said. "I was hired to drive and not to fly."
The servant may not have appreciated it, but he had just made history by completing the first manned flight in a fixed-wing aircraft.
Amazingly, the inventor whose vision made it possible has been largely forgotten in his own country.
"The French and the Americans take more interest in Sir George than we do," says the Reverend Leonard Rivett, a retired pastor who has spent years documenting the Cayley story.
"He laid the foundations of aeronautics in 1799 by discovering the principles of lift and thrust, and the means of vertical and horizontal control.
"The Wright Brothers knew that an Englishman had worked out the theory, and asked for his research.
"If Cayley had come across a lightweight engine, we would have had powered flight 50s years before the Wrights."
But back in the 19th Century, the Yorkshire inventor was way ahead of the available technology.
Powered flight would have to wait for the Wright Flyer with its simple 12-horsepower engine.
The importance of Cayley's work has been acknowledged by the US space agency Nasa, and many other scientific institutions around the world.