When people began to try to create a "flying machine" in the eighteenth century,
they used hot-air balloons. These balloons went up into the air but then could not be
controlled. They went wherever the wind was blowing. The idea of a real flying
machine remained a dream for a long time. That dream finally came true in 1903,
when Wilbur and Orville Wright
a. invented a new kind of engine.
b. made their first successful flight in an airplane