How Do You Measure Time?

Provides an overview of the design, uses, weapons, and equipment of U.S. Navy submarines. Written in English and Spanish.

Inspirado en el bestseller #1 del New York Times She Persisted de Chelsea Clinton y Alexandra Boiger, llega ahora esta serie en Chapter Books sobre mujeres que sobresalieron, lucharon y se levantaron contra viento y marea. Harriet Tubman, quien nació esclavizada, se convirtió en una de las conductoras más exitosas, más decidida y conocida del Ferrocarril Subterráneo. Con el amor de su familia firmemente plantado en su corazón, Harriet miró a la Estrella del Norte en busca de orientación para escapar, y su luz la ayudó a salir de la esclavitud. Su coraje le permitió ayudar a muchos...

Blobfish, pangolin, and flower mantis are just a few of the names of the bizarre bugs and animals that readers will learn about in this fascinating, Spanish-translated nonfiction title. Through vibrant images and photos, informational text, a glossary of terms, and an index, readers will learn some of the strange ways that arthropods, invertebrates, and mammals have adapted over time to camouflage themselves and develop interesting ways to keep predators away.

The asteroid belt between Mars and Jupiter is an intriguing area of our solar system. Scientists have counted over 670,000 known asteroids there, but there could be millions more not yet found. Readers will discover much more about the asteroid belt in this highinterest book, which blends science and math. They'll read about several topics, such as space missions to the asteroid belt and the difference between an asteroid and a planet, and solve associated math problems-just like actual space scientists do!

Nuestro mundo, with Tu mundo, is a complete, two-level Spanish program for native Spanish speakers, providing focused treatment of Spanish-speaking peoples, including language, literature, culture, and history.