Espacios de la memoria

Recent advancements in science have spurred new hypotheses for ancient mysteries that have baffled mankind for centuries, and this book explores those enigmas and their new explanations. Shedding light on questions such as Was Tutankhamen’s tomb guarded by a curse? and Was Stonehenge a prehistoric astronomical observatory?, this guide discusses ancient civilizations, ruins, and legends—including Atlantis, the curse of the pharaohs, and the hidden Mayan cities—and proposes whether they are truth or myth. Los recientes adelantos de la ciencia han permitido que surjan nuevas hipótesis...

Se cuenta la historia de la puesta en marcha de la reforma militar borbónica en Veracruz, desde el año 1764 hasta la rendición del último reducto español en 1825. El peligro, más que provenir del exterior, estaba incubándose en el seno mismo de la sociedad que se pretendía defender. Un panorama incierto donde se expresaron con mayor fuerza y nitidez las fracturas, las demandas, los odios, los resentimientos y el reacomodo de nuevos actores y fuerzas políticas e ideológicas

A compilation of a wide variety of essays on the monetary history of Puerto Rico, as well as general numismatic topics, such as standing liberty quarters, transportation tokens, cobs, love tokens, and other.

This is the second of three volumes which together contain the complete range of Lord Rutherford’s scientific papers, incorporating in addition addresses, general lectures, letters to editors, accounts of his scientific work and personal recollections by friends and colleagues. Volume two, first published in 1963, includes the papers published by Rutherford when professor of Physics at Manchester, 1907 to 1919. While the work of his laboratory ranged over the whole field of radioactivity, he himself devoted much effort to questions concerning the nature and properties of the α particle....