GALILEO Galileo Galilei was born in Pisa, Italy on February 15, 1564. Galileo lived in Pisa until he was about 10 years old. In 1574 his family moved to Florence where Galileo started his education at a monestary named Vallombroso, . In 1581, Galileo went to the University of Pisa to study medicine, while at the University of Pisa, Galileo discovered an interest in Physics and Mathematics; he switched his major from medicine to mathematics. In 1585, he left the university to become a teacher. During a four year unemployment he tutored and perfected theories. In 1589, Galileo was given the job of professor of Mathematics at the University of Pisa and received another job at the University of Padua as the chair of Mathematics. Galileo taught at the university for eighteen years. In 1584, Galileo discovered the principle of which showed that the period of a pendulum remains the same no matter what the amplitude is.

Galileo discovered this while watching a chandelier swing in the cathedral next to the Tower of Pisa. He proved the isochronism theory in 1602. In 1606, he invented the hydro-static balance this device that found the specific gravity of substances by weighing them under water. Galileo also found that Aristotle's belief that objects fall at velocities proportional to their weight was wrong. He found that all objects fall at the same rate; it's only the density of the median they fall through that causes larger objects to fall slower. Galileo made many discoveries while he was teaching at the University of Padua including a calculating compass, a thermometer, a pump,and the theory of parabola. The parabola was due to the combined forces of horizontal motion and vertical acceleration. This theory was very useful in the firing of guns, and rockets. Another discovery Galileo...