<human>:  I have a question about the book “The Invention of Wings” by Nancy Randolph. When did the Wright brothers first fly?
<bot>: The Wright brothers first flew on December 17, 1903. They flew a glider that was powered by a bicycle engine. The glider was made of wood and canvas, and it had two wings. The wings were made of wood and fabric, and they were attached to the glider with wires.