This popular-sicence book of the famous Swiss mathematician, physisist, mechanic Leonhard Euler (1707-1783) has number of merits, which make it unique during the history of this genre. These are: depth of the text, comprehensiveness, scientific value.The book is written in 3 volumes. Euler has touched virtually all aspects of his contemporary physics. The first volume is about sound vibrations and music, light phenomena and optics, meteorological effects, gravitation, mechanical motion.