Melatonia/ Melatonic

Presented as a catalogue, the authors provide complete and true information about endangered Mexican Freshwater fishes. A physical and ethological description, the reason of its involvement in the book, preservation state, natural history and ecology, as well as a map with its geographical location in Mexico, and a picture of the specie is provided for each fish. This book is a start point for the knowledge and preservation of the richness of this biological group.

In the framework of the 20th International Congress of History of Science (Liege 1997), a symposium was devoted to the historical work of Adolph P. Youschkevitch (1906-1993). The present volume includes the papers read during the symposium as well as contributions on current issues in the history of mathematics: mathematics as a cultural strength, mathematics from antiquity to the classical period, probability theory and its applications, mathematics in the 19th and 20th centuries.

In a world full of false information, prejudices, myths, deceits and poor knowledge, nobody is the possessor of the supreme truth or has the definitive answers to our questions (not even Google). However, logical and skeptical thinking is our weapon to combat false argumentation, crazy reasoning and superstition. It is a difficult process that requires our full attention, but it is worth it. The Universe's Guide to Skeptics will explain the principles of skeptical thinking and teach you how it has served to debunk some of the greatest conspiracy myths, fallacies, and theories, from homeopathy ...

El cielo es un símbolo supremo, un arquetipo capital en todas las culturas porque une dos extremos: por un lado, la realidad física espacial, con sus sistemas planetarios, sus cuerpos celestes, energías cósmicas y movimiento mecánico; por otro, está vinculado a un mundo de metáforas, parábolas de verdades eternas, contemplaciones sagradas y emociones trascendentes. Este volumen pretende ser una antología ideal que ilustre mejor el imaginario acerca de la bóveda celeste. Entre los miles de posibles testigos y autores, se ha elegido a Plinio el Viejo, muerto en Stabias en el 79 d. C....