Un cuadrado? Un rectángulo!

California became a territory in the United States when the Treaty of Guadalupe Hidalgo was signed in 1848. That treaty ended the Mexican War. Several days before its signing, gold was discovered at Sutter’s Mill in what is now Sacramento. The non-Native population of the territory was less than one thousand in 1848, but the gold rush increased that number to one hundred thousand by the end of 1849. The gold rush not only made many people wealthy, it brought ecologic devastation while speeding up California’s statehood. This book richly explores this interesting history.

Hay pocos terrenos tan abonados con creencias falsas como el de la sexualidad. La información con que muchos jóvenes cuentan proviene de personas tan mal enteradas como ellos o de otras fuentes poco fiables. En cambio, una educación sexual basada en información fidedigna mejora las relaciones entre hombres y mujeres, propicia una sexualidad gozosa y libre y ayuda a prevenir diversos problemas, desde infecciones de transmisión sexual hasta abusos sexuales infantiles. Aquí se organizan temáticamente las preguntas e inquietudes más frecuentes de los jóvenes en torno al cuerpo, el amor y ...

Narwhals are often called the "unicorns of the sea." But these fascinating creatures are members of the whale family. Read all about narwhals as you practice addition. This Spanish math book combines math and reading skills and uses real-life examples of problem solving to teach subject-area content. The dynamic images, detailed sidebars, practice problems, and math diagrams make learning addition easy and fun. Text features include a table of contents, a glossary, an index, and captions to build vocabulary and increase understanding of math and reading concepts. An in-depth problem-solving...

The use of calendars dates back thousands of years. Why are we driven to record time, and what would happen if we did not? Who created the concept of calendars? Why do different cultures use different calendar systems? And why are calendars so important to us? It is about "time" we found out! Created in collaboration with the Smithsonian Institution, this Spanish-translated Smithsonian Informational Text builds reading skills while engaging students' curiosity about STEAM topics through real-world examples. Packed with factoids and informative sidebars, it features a hands-on STEAM challenge...