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.

En mi cuaderno de investigaciones tenía una gran lista de preguntas pendientes sobre el universo y todo lo que nos rodea. Bitácora secreta de Pachi: - ¿Tiene olor la lluvia? - ¿Por qué las hojas de los árboles cambian de color en otoño? - ¿Los humanos siempre tuvimos cinco dedos? - ¿De dónde viene la sal del mar? - ¿Por qué titilan las estrellas? Con mi papá empezamos un estudio en terreno: nos fuimos de viaje, acampamos, cocinamos juntos, jugamos con legos, vimos películas… ¡y le pusimos CHECK a mi lista de la forma más entretenida! ENGLISH DESCRIPTION In my research...

Muddy Creek in Edgewater, Maryland is the site of a major makeover. The land around the stream has worn down. Find out what caused Muddy Creek to erode, and the many steps involved in saving it. Created in collaboration with the Smithsonian Institution, this Smithsonian Informational Text builds students' reading skills while engaging their curiosity about STEAM topics through real-world examples. It features a hands-on STEAM challenge that guides students through every step of the engineering design process, from the initial research and brainstorming sessions, through the design and testing ...

Al oír contar la historia de los atentados del 11 de septiembre por un joven Maasai que estaba en Nueva York en aquel día, los miembros de la tribu deciden de donar al pueblo estadounidense catorce vacas sagradas como regalo curativo.

From art and architecture to politics, philosophy, and mathematics, "western civilization" owes a great deal to the achievements of ancient Greece, but what do we really know about this long-gone civilization? How did geography influence the politics of the Greek city-states? What's the difference between an agora and an acropolis? This book takes readers several thousand years into the past, when independent city-states ruled the Mediterranean Sea, to find the answers. Full-color photographs and maps, accompanied by accessible text, introduce readers to the many contributions the ancient...