Arqueólogos por accidente

This starter volume uses everyday examples such as a baseball and a beach ball to demonstrate the contrast between hard and soft objects.

Life on Earth depends on carbon. In fact, about 18.5 percent of a human body's mass is carbon. How carbon is taking in and given off through animals' breathing, the burning of fossil fuels, and more can be shown in the model known as the carbon cycle. Though this concept can be confusing, all readers have a chance to understand this concept through the text and simple diagrams in this book. Both struggling readers and those looking for review can find the most important components and vocabulary of the carbon cycle in low-level, accessible text.

¿Sientes que últimamente se te olvidan las cosas o que no puedes recordar los nombres? ¿Te cuesta a veces encontrar las palabras correctas para expresarte? No te preocupes, este libro es perfecto para ti. Con el paso de los años comienza a decaer el rendimiento físico e intelectual; es la evolución normal de toda persona. Sin embargo, no tienes por qué resignarte: igual que al ejercitar el cuerpo combatimos el envejecimiento físico, al entrenar nuestra mente rejuvenecemos el cerebro y fortalecemos sus funciones. Gracias a los sencillos ejercicios que contiene este libro, preparados...

In this bilingual picture book, astronaut José M. Hernández recounts his childhood as the son of Mexican migrant workers and his life-long dream to travel to the stars.