Unterredungen und mathematische demonstrationen uber zwei neue wissenszweige, die mechanik und die fallgesetze betreffend by Galileo Galilei. Galileo Galilei (15 February 1564 - 8 January 1642), was an Italian astronomer, physicist, engineer, philosopher, and mathematician who played a major role in the scientific revolution during the Renaissance. This book is a reproduction of the original book published in 1891 and may have some imperfections such as marks or hand-written notes."