Wright Brothers (Orville & Wilbur) — "The greatest value of our experiments has been their negative results."

"Our confidence in the ability of men to fly has not been shaken."

"If we worked on the assumption that what is currently accepted as true really is true, then there would be little hope for advance."

"I think it will be a long time yet before anyone will be flying at any great height or speed."

"I confess that, in 1901, I said to my brother Orville that men would not fly for 50 years. Two years later, we were making flights. This demonstration of my inability as a prophet gave me such a shock…"

"It is a pleasure to be able to inform you that the machine has been a success."