Galileo Galilei is one of the best-known scientists of the Renaissance. In Italy, he made contributions to the fields of astronomy, mathematics and physics. He is known as the "father of the scientific method", the method of testing a theory with experiments that is still in use today. He invented the first practical telescope, discovered inertia, and designed a way to build a pendulum clock. Galileo Galileo's wide-ranging interests in astronomy, mathematics, and physics changed scientific thinking and… Galileo was interested in a wide range of topics “As a teenager, Galileo was tempted to enter a monastery (Hart-Davis 82 ) Sixty years after Galileo decided not to join a monastery, Galileo was tried by the Catholic Church for heresy and sentenced to life in prison (reduced to permanent house arrest). to medical school. Galileo attended medical school at the University of Pisa, although he ended up spending more time studying mathematics. While at the University of Pisa, Galileo contributed to medicine with a pulse meter equipped with an adjustable string that would swing in time with the patient's heartbeat and a scale based on the length of the pendulum string would tell the doctor how fast the heart was beating . Galileo's pulse meter invention was stolen by medical authorities, but Galileo later had inventions for which he received credit. (Hart-Davis 82, 83)In 1590, Galileo began his study of motion, disproving that the weight of an object affected the object's acceleration. Galileo designed an experiment in which he rolled balls along an inclined plane with smooth grooves so that the balls would roll down... into the center of the paper... A gap appeared at the top of the mercury tube, and that was the gap it was a void. Another invention that Galileo contributed to was the invention of the pendulum clock. As a medical student, Galileo realized that a pendulum would be a good way to keep time. Galileo designed the first pendulum clock late in life. When he designed the clock, he was blind, so he couldn't build it, and when his son built the clock, the clock didn't work very well. The first successful pendulum clock was built (and patented) by Christaan ​​Huygens. Huygens, a Dutch scientist, made many other important contributions to the field of science, such as the theory of light waves and built the most powerful telescope of his time. Pendulum clocks were the most accurate clocks until the 20th century, and the standard time for the United States was based on early 19th-century pendulum clocks. 1900..