Diseño e historia

¿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 ...

The sun gives us warmth and light. It makes the seasons change. Our sun is very important! Learn about the sun with this engaging Spanish science reader. With easy-to-read text, this book teaches students important scientific concepts and vocabulary. Aligned to state and national standards, the book contains nonfiction text features like an index, a glossary, captions, bold font, and detailed images to keep students connected to the text. A hands-on science experiment helps students apply what they have learned and develops critical thinking skills.

Presents the Aztec tale of how warring gods Quetzalcoatl and Tezcatlipoca helped to form the Earth when they joined together to conquer the goddess Tlatecuhtli.

Fruits and vegetables both come from plants. Fruits have seeds. Vegetables do not. Let’s learn more about fruits and vegetables. Paired to the fiction title Planting Seeds.