100 mitos

Introduces different kinds of light, the properties of light, and how light can create shadows of different shapes and sizes.

¿Y si el universo no pesara nada y la materia no existiera realmente? Lo que parecería ser una duda legítima para un erudito místico de los Vedas Indios es, en cambio, un resultado embarazoso de la aplicación de la Relatividad Restringida a las observaciones obtenidas por un grupo de astrofísicos, que han medido la radiación cósmica de fondo de nuestro universo. En los albores del nuevo milenio, el satélite WMAP, más allá de proporcionarnos una medida del cosmos, nunca antes obtenida, ha creado bastantes quebraderos de cabeza respecto al concepto de universo, en el que todavía hoy ...

In 1939, a war that would encompass the world began in Europe. Readers will learn about the causes of World War II in this nonfiction Spanish-translated book. The supportive text and fascinating sidebars work in conjunction with the stunning photos and appealing scrapbook layout to provide an enjoyable and enlightening experience that teaches readers about such events and topics as Pearl Harbor, blitzkreig, and concentration and internment camps. Readers will also learn about infamous figures from the war like Adolph Hitler, Sir Winston Churchill, Franklin Roosevelt, and even Rosie the...

Many people know that Benjamin Franklin discovered electricity through lightning, but he was also a great inventor and helped write the Declaration of Independence! Young readers will learn about Franklin's life in this appealing biography that has been translated into Spanish and features plenty of vibrant images, supportive text, "Fun Fact" boxes, and an accommodating timeline, glossary, and index.