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Examines the nature of inclined planes and wedges, how they can reduce the amount of force necessary to perform work, and ways in which they are used.

What is work? You may think work is doing chores or going to a job, but you do work every time you move something from one place to another. With experiments that demonstrate these fundamental concepts, discover how you work, and how simple machines make doing work easier.

Adiós a las trampas es el resultado de un concurso convocado por el IFE, el Conaculta y la Secodam en donde los niños y los adolescentes mexicanos expresaron su opinión sobre la corrupción en un dibujo. Si bien es difícil predicar con el ejemplo, los niños muestran una conciencia cívica ejemplar; ello es reconocido por los adultos que acompañan los dibujos de este libro: Germán Dehesa, Carlos Elizondo Mayer-Serra, Denise Dresser y Federico Reyes Heroles.

GRADES K–2: This Spanish title introduces early elementary students to some of the ways police officers help our communities. EARLY BILINGUAL LITERACY: Help young learners strengthen their bilingual skills—add the English version of this title into your collection, too. WHY COMMUNITY HELPERS: This collection introduces important information with kid-friendly language and engages with vivid photos and real examples. BUILD A LIBRARY: Collect every title from the collection to stock your home or classroom library. Reading together is a great way to bond while fostering communication and a...