205 Author’s Note Heron, also known as Hero, lived in Alexandria in the first century A.D. While we do not know much about his life, we do have copies of his writings on diverse mathematical and scientific subjects, which include a fire engine, singing mechanical birds, automatic doors, and the first steam-powered engine. He also contributed to the science of geometry, and his treatise Metrica describes many of the formulae and methods that are still in use today.
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