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.

Visiting Tulum National Park is like going back in time. The Maya lived there long ago. Learn addition as you count the things they left behind. 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 section provides...

The US president is the face of the United States to the rest of the world. However, he or she doesn’t have unlimited power within the country. The president has certain powers given by the Constitution, including the ability to make treaties, appoint some important government officials, and veto laws. Readers learn the many duties of the president in simple, clear language appropriate for both younger readers and older readers looking for a succinct review of the topic. Fact boxes supplement the main content with important details about checks and balances, amendments, and more that affect...

«Creo que, en el fondo, toda la música es igual. Trata de comunicar emociones. Y por eso me gusta tanto. No querría dedicarme a nada más.» Austin Mahone No puedo creer lo mucho que ha cambiado mi vida en los últimos años. Crecí en una pequeña ciudad de Texas y, aunque soñaba con ver mundo, me parecía imposible. Solo era un niño que cantaba y se divertía en YouTube con sus amigos. Ahora he recorrido Estados Unidos entero. He viajado a Inglaterra, Japón y Sudamérica. He actuado en televisión, eventos deportivos y estadios. He logrado algunas de mis aspiraciones musicales. Sigo...

At an early age, Steve fell in love with the possibility of the computer machine. He knew it had the power to change someone's life. Inspired to create a personal computer accessible for everyone, Steve went on to become one of the most influential inventors the world has ever met. This inspiring story of the visionary and entrepreneur features a facts and photos section at the back.