Product Description: The volume contains 320 letters and enclosures from around 30 correspondences. Four major developments dominate his conversations during these three years and lead to new themes: the astronomical, political, and theological aspects of the 1700 Protestant calendar reform; the newly founded Sozietat der Wissenschaften in Berlin; the discussion on Leibniz s differential calculus, and the controversy with Denis Papin concerning dynamics...read more

Explores the solar system and beyond, providing information on the planets, stars, and scientific expeditions made by man in space.

An introduction to famous paintings includes many facts about the artists and their lives, and how they created their work, to help beginners understand what art is and why people think it is important.

Describes how a caterpillar develops into a butterfly, and discusses moths and the feeding habits and defenses of butterflies.

Describes how seeds develop into flowering plants, and how flowers lead to the production of new plants, and discusses how plants make their own food and the various kinds of flowers that live in different environments.