Sin patrón

From the first crude stone tools used by man two-and-a-half million years ago up to the early medieval period, this eye-opening journey through human innovations draws on modern science and the latest research to explore some of history's most fascinating inventions. Beginning with the basic technologies of stone and fire, bone and wood, the survey moves on to answer such fundamental questions as How and where did agriculture evolve? and How did Romans and others heat and plumb their dwellings? This unique guide to some of humanity's most remarkable inventions is a testimony to the brilliant...

This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute...

This study is a highly innovative body of research on the supply of raw material in prehistoric Iberia. The archaeological assemblages from recently excavated sites in north-eastern Spain are clearly presented, as are the various methods for the characterisation of flints and the determination of geological origins. The study is important in terms of the new data provided on raw material supply at the end of the Upper Palaeolithic in Iberia and a reconstruction of mobility patterns and resource exploitation of hunter-gatherer groups during the Pleistocene/Holocene transition. In Spanish.

El guano, las aves y las islas guaneras han jugado un papel inmenso en nuestra historia desde la época precolombina; así, los antiguos peruanos consideraban esas islas, los seres que las habitaban y los excrementos que las cubrían como sagrados y dignos de ser venerados. A mediados del siglo XIX, el guano irrumpió en el mundo como materia prima agrícola, en el momento álgido de la era de la mercantilización. En Perú se suele ver esta Edad del Guano como una época de oportunidades perdidas; no obstante, aún queda mucho que aprender de la "falaz prosperidad" que precedió al...