Piedra de toque

From “astronauta” to “zapatero,” the children in this book want to have the most amazing jobs! The rhyming text and adorable photographs make learning the letters of the alphabet and their sounds easy and entertaining. Children will also enjoy finding out what each job involves. Includes a glossary and four pages of fun facts about the jobs mentioned in the text.

Introduces the concept of heat, how it's created, how it affects materials around it, and how heat is used.

How do you truly engage students in learning history? When students make personal connections to the subject, they’re much more motivated to learn. This Spanish book provides firsthand accounts of history that give personal insights into historical events. Students will learn about Alta California by examining the maps, letters, images, photographs, and art that emerged during the Mexican rule of California. With a visually appealing layout, this book features captivating text, fun facts, sidebars, and time lines that help students grasp the essential concepts they need to know at their...

Planck consideró como tarea científica suprema la búsqueda de las leyes que rigen el absoluto, el invariante oculto en la realidad externa. Le cupo el privilegio de descubrir uno de esos elementos universales: el quantum de acción, la constante h.