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.

The sun is responsible for all life on Earth, but what exactly is it? Our star is an amazing force that can be as dangerous as it is important. From solar flares to the threat of blowing up altogether, the sun is one of the most interesting things in our solar system. Readers take a trip to the sun to see how it works and exactly what it is made of. They’ll learn about the life cycle of a star and see just how long we have until we have to find a new planet to call home. Don’t worry, they’ll be happy to learn that (hopefully) we have millions of years left!

Through innovation and imagination, savvy entrepreneur Richard King became a towering figure in the Texas cattle industry. The King Ranch, which continues to flourish today, is a symbol of his enduring legacy.

Imagine getting ready for bed when the sun is still shining, or eating lunch when it’s dark outside. How are such things possible? Learn how people in places such as Alaska, Norway, Iceland, Sweden, and Canada cope with days and days of sunlight and darkness. Created in collaboration with the Smithsonian Institution, this STEAM book will ignite a curiosity about STEAM topics through real-world examples. It features a hands-on STEAM challenge that is perfect for makerspaces and that guides students step-by-step through the engineering design process. Make STEAM career connections with career...

Las composiciones de Beethoven expresan siempre fuerza y diversidad, por eso resulta complejo resumir su originalidad y personalidad. Beethoven supo plasmar en su música los momentos más notables de su vida, los sentimientos de alegría, de sufrimiento o de amor. La confluencia de los ideales revolucionarios de la época con el carácter, apasionado y profundo, del artista desempeñó sin duda un papel fundamental en la revolución musical que representó su obra.