Along with an examination of Galileo's specific discoveries such as the first air thermometer, the lawns of the pendulum and falling bodies, and the invention of the telescope which led to his wide discoveries in astronomy, an emphasis is placed on his most important yet intangible discovery, his insistence on measuring, weighing and timing, in short, on experimentation. Forced to deny the Copernican theory at the Inquisition, Galileo died a broken man.