70 preguntas curiosas sobre el mundo que nos rodea y sus asombrosas respuestas

These biographies introduce young readers to important figures in American history. Ideal for reports and correlated to the social studies curriculum, the series presents a straightforward account of each individual's life and times and describes how each person contributed to the shaping of our nation.

¿Piensas que la filosofía es algo anticuado, abstracto y aburrido? Este libro te demostrará que te equivocas. A través de las historias de 100 filósofos y pensadores de todas las épocas y lugares, descubrirás que la filosofía está más viva que nunca. Junto a Sócrates, Hipatia, Kant y Voltaire, aprenderás a reflexionar sobre diferentes temas, desde los fenómenos de la naturaleza hasta el ser humano, desde el lenguaje hasta el amor, incluso sobre la existencia de Dios. Una historia para cada día, que comienza con preguntas y curiosidades sobre la vida diaria, que estimularán y...

"Some things are so huge or so old that it's hard to wrap your mind around them. But what if we took these big, hard-to-imagine objects and events and compared them to things we can see, feel and touch? Instantly, we'd see our world in a whole new way." So begins this endlessly intriguing guide to better understanding all those really big ideas and numbers children come across on a regular basis. Author David J. Smith has found clever devices to scale down everything from time lines (the history of Earth compressed into one year), to quantities (all the wealth in the world divided into one...

Land has many different characteristics. It can be hilly, rocky, grassy, narrow, and dry. Or, it can be flat, smooth, sandy, wide, and wet! This Spanish book introduces students to the concept of landforms. With images that are easy to identify and clear, simple sentence structures, this science reader simplifies scientific concepts for young students as they improve their reading skills. A fun and easy science experiment and Your Turn! activity provide more in-depth opportunities for additional learning. Nonfiction text features include a glossary and an index. Engage students in learning...