This book invites the reader to understand our Universe, not just marvel at it. From the clock-like motions of the planets to the catastrophic collapse of a star into a black hole, gravity controls the Universe. Gravity is central to modern physics, helping to answer the deepest questions about the nature of time, the origin of the Universe and the unification of the forces of nature. Linking key experiments and observations through careful physical reasoning, the author builds the reader's insight step-by-step from simple but profound facts about gravity on Earth to the frontiers of research. Topics covered include the nature of stars and galaxies, the mysteries of dark matter and dark energy, black holes, gravitational waves, inflation and the Big Bang. Suitable for general readers and for undergraduate courses, the treatment uses only high-school level mathematics, supplemented by optional computer programs, to explain the laws of physics governing gravity.

Nature Spirituality from the Ground Up invites you to go beyond simply exploring the symbols of nature and encourages you to bury your hands in the earth and work with the real thing. This is a book on green spirituality that makes a difference, empowering you to connect with totems as a part of your spiritual life. Uniquely approaching totems as beings we can give to, rather than take from, Lupa shows how orienting yourself this way deepens your spiritual connection to the earth and helps you rejoin the community of nature. And while most books on totems focus on animals, Nature Spirituality from the Ground Up helps you work with interconnected ecosystems of totems: plants, fungi, minerals, waterways, landforms, and more.

Growing up on the family ranch, Linda Finley fought hard to gain the acceptance and respect as a ranch hand that her brothers took for granted. Arlene Pile barely remembers learning to ride a horse and run machinery--she was so young. She learned to drive on an 8N Ford tractor with a buck rake. Lee Jacobsen became the first woman in the state licensed to artificially inseminate cattle. Meet these and other Montana women passionate about caring for their land and determined to make the lifestyle their own. Many never doubted for a moment that they would spend their lives in agriculture, while others speak of their surprise and delight to find themselves living on the land. All agree that they wouldn't be happy doing anything else.

Vols. 30-54 (1932-46) issued in 2 separately paged sections: General editorial section and a Transactions section. Beginning in 1947, the Transactions section is continued as SAE quarterly transactions.