The Montgolfier Brothers

After discovering that heated air in a lightweight bag would cause the bag to rise, French brothers Joseph-Michel and Jacques-Étienne Montgolfier invented a contraption that would come to be known as the hot-air balloon. In 1783, they held the first public demonstration of their invention and, just months later, the first manned free flight. Before humans were sent up in the balloon, a test flight was made using three animals: a sheep, a duck, and a rooster. Why were these animals chosen? Discuss

Source: The Free Dictionary

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