Los Artículos de la Confederación (Articles of Confederation)

When we look up at the night sky you can see millions of stars, but what do you think we could see in space if we left Earth? If we could hop into a special ship and blast off, traveling billions of miles away from Earth, we’d see the Milky Way galaxy. In this book, readers take an incredible journey through that galaxy, exploring the universe and learning how it was formed and what will one day happen to these enormous groups of stars. From mysterious dark matter to the black holes at the center of galaxies, readers will also dive into the mysteries of the universe scientists have spent...

The idea of the Roaring '20s conjures up images of speakeasies, women with short, saucy hairdos, and hot jazz. Readers will learn about the historical events that define this decade, including the devastating war that preceded it. An explanation about project-based learning will help readers understand how it can help them research their topic in unique and interesting ways. Constructive suggestions offer ideas for projects, while encouraging readers to take their studies in new and interesting directions.

Even the smallest tide pools are actually entire ecosystems! The creatures that call a tide pool home are connected through food chains that represent the passing of energy from one living thing to another. Readers discover how these unique food chains all come together as they view a helpful tide pool food web. Fun fact boxes accompany informative text about life in a tide pool. Detailed photographs of tide pool ecosystems introduce readers to a variety of cool creatures.

En este volumen, aprenderás a diferenciar las principales especies de lagartos, un reptil que vive en hábitats muy variados y que tienen costumbres tan curiosas domo la del camaleón de cambiar el color de su piel para adaptarlo al color del entorno. Conocerás también a lagartos de tamaños tan dispares como el varano gigante, de más de tres metros de longitud, y el geco, que apenas alcanza los diez centímetros y descubirás que los lagartos se deshacen de una parte de la cola para engañar a sus enemigos.

¿Cómo ven, oyen, huelen, saborean y tocan los animales? ¿Sus sentidos son como los nuestros o son especiales? ¿Solo hay cinco sentidos en el mundo animal o hay más? Irene y Bruno tienen mucha curiosidad y quieren saber todo sobre los sentidos. Déjate guiar y acompáñalos en este viaje increíble en el que conocerás la respuesta a preguntas que quizá alguna vez también tú te hayas hecho. Incluye una guía para padres, con mucha información y curiosidades sobre los sentidos animales.

The ancient Polynesians were amazing navigators who traversed the Pacific Ocean and settled in its many islands. How did they travel such extreme distances and know where they were going without the use of modern technology like smartphones, satellites, or even magnetic compasses to guide them? Learn the answer to these questions in this Spanish book that uses real-world examples to illustrate science concepts. Created in collaboration with the Smithsonian Institution, this Informational Text builds reading skills while engaging students' curiosity about STEAM topics. Packed with factoids and ...