Trampas mentales

El sabueso de los Baskerville es la más famosa y para muchos la mejor aventura de Sherlock Holmes. La novela surgió de un comentario que escuchó Conan Doyle de su amigo Fletcher Robinson sobre un perro espectral que merodeaba cerca de su casa en Dartmoor. Fue publicada por primera vez como serial en The Strand Magazine en 1901, y al año siguiente en forma de libro debido a su enorme éxito. Desaparecido en las cataratas de Reichenbach cuando resolvía el caso de “El problema final” –última historia de Las aventuras de Sherlock Holmes (no 4 de El Canon)–, el gran detective...

What does swimming in a pool, drinking through a straw, breathing in air, and circulating blood all have in common? They all require a form of air or water pressure! Readers will discover the variety of ways that air and water pressure make an impact on our lives and the things in them. This fact-filled, Spanish-translated nonfiction title includes real-life examples and basic experiments to aid in the development of understanding physic and scientific concepts. Readers will be introduced to and learn about Archimedes Principle, atmospheric pressure, vacuums, water density, and hydraulics...

Explores The Number Twelve With Relationship To Time, Counting, And Things That Are Sold By The Dozen.

When President Thomas Jefferson bought the Louisiana Territory from cash-strapped France in 1803, he doubled the size of the United States without really knowing what he was getting. He dispatched Meriwether Lewis and William Clark and their Corps of Discovery to explore a territory that would include part or all of fifteen future states and to seek a water route to the West Coast. Westward expansion began immediately, all for the bargain price of 15 million dollars. This book richly explores this fascinating part of history.