Nel 1922 il matematico e filosofo Alfred North Whitehead denuncia alcune incongruenze concettuali della relativitą generale di Einstein e propone una teoria gravitazionale alternativa, diretta emanazione di riflessioni metafisiche, che rifiuta la curvatura variabile dello spaziotempo. La 'relativitą di Whitehead', nel corso degli anni, supera sorprendentemente gli stessi test della relativitą generale, fino ad arrivare a candidarsi come autentica 'spina nel fianco di Einstein'. Fino al 2007, quando un saggio dei fisici Will e Gibbons la confuta in maniera presumibilmente definitiva. Nel presente volume, 'The Principle of Relativitą' viene finalmente pubblicato in traduzione italiana, preceduto da un ampio apparato introduttivo, per celebrare degnamente la conclusione di un'avventura dal grande fascino intellettuale.

This four-volume set, edited by leading experts in soil science, brings together in one collection a series of papers that have been fundamental to the development of soil science as a defined discipline. Volume I contains papers that look at the soil as a natural body and speculate on how it was formed, the extent of its global coverage, and the many complex interactions with the biosphere, hydrosphere, atmosphere, and lithosphere. It focuses its attention on the 'what' of the pedosphere and the extent of our current understanding of it.Volume II focuses on the 'how' of soils, the understanding of fundamental processes. It is concerned with the integration of physics, chemistry, biology and mineralogy to understand fundamental soil properties and processes that control transport, cycling, speciation and bioavailability of elements or molecules. These phenomena are studied at multiple scales ranging from atomic to global. Volume III contains papers on 'why' soil science is important to society. It demonstrates the application of fundamental knowledge to solve social, economic, and environmental challenges of major societal and scientific interest. It can be considered the applied segment of soil science to ensure that soils are used and managed in a sustainable manner.Volume IV contains papers that are more general and address the transfer of knowledge to segments of society where soil science is misunderstood or under-appreciated. It addresses public literacy in soil science, education, international conventions, consequences of human activities on soil ecosystems, policy issues, food security, and philosophy and history of the discipline.

'Like Muir himself, Essential Muir packs an astounding range of experience into a lithe frame: ecstatic yet scientific descriptions of Yosemite; the heartrending tale of that 'wee, hairy, sleekit beastie,' Stickeen; reflections on the society of Eskimos; Muir's touching tribute, after a lifetime of wonder, to the mighty baobob trees of Africa; and more. Fred D. White's selection from Muir's writings, and his illuminating commentary, reveal the coherence and drama of a remarkable life: new readers will understand why Muir has become an American icon, and readers who are familiar with his work will be delighted with this fresh look. Muir's fierce love of all of nature, from squirrels to glaciers (but perhaps not sheep), continues to inspire us nearly a century after his death.'--Book jacket.

Swan Song

Like the rest of his family, Louis is a trumpeter swan. But unlike his four brothers and sisters, Louis can't trumpet joyfully. In fact, he can't even make a sound. And since he can't trumpet his love, the beautiful swan Serena pays absolutely no attention to him.

Louis tries everything he can think of to win Serena's affection--he even goes to school to learn to read and write. But nothing seems to work. Then his father steals him a real brass trumpet. Is a musical instrument the key to winning Louis his love?

Volume 12 of The Correspondence of Charles Darwin provides the full authoritative texts of all known and available letters to and from Charles Darwin. The letters are accompanied by detailed explanatory footnotes and relevant supplementary materials, offering unparalleled insights into Darwin's experiments, thoughts, friendships, and family life. Volume 12 of this continuing series contains letters from 1864, when Darwin, despite continuing illness, was carrying out botanical experiments and working on his book, The Variation of Plants and Animals Under Domestication.

Swan Song

Like the rest of his family, Louis is a trumpeter swan. But unlike his four brothers and sisters, Louis can't trumpet joyfully. In fact, he can't even make a sound. And since he can't trumpet his love, the beautiful swan Serena pays absolutely no attention to him.

Louis tries everything he can think of to win Serena's affection -- he even goes to school to learn to read and write. But nothing seems to work. Then his father steals him a real brass trumpet. Is a musical instrument the key to winning Louis his love?

Swan Song

Like the rest of his family, Louis is a trumpeter swan. But unlike his four brothers and sisters, Louis can't trumpet joyfully. In fact, he can't even make a sound. And since he can't trumpet his love, the beautiful swan Serena pays absolutely no attention to him.

Louis tries everything he can think of to win Serena's affection--he even goes to school to learn to read and write. But nothing seems to work. Then his father steals him a real brass trumpet. Is a musical instrument the key to winning Louis his love?

Charlotte's Web
pictures by Garth Williams

The Newbery Honor-winning story of a remarkable pig and the spiderwho changed his life.

Stuart Little
pictures by Garth Williams

A most unusual mouse sets out on the adventure of a lifetime.

The Trumpet of the Swan
new pictures by Caldecott Honor Artist Fred Marcellino

The joyous tale of Louis, a trumpeter swan in search of his voice.