El ciclo del nitrógeno (The Nitrogen Cycle)

La incorporacion de la mujer almundo laboral es uno de los grandes logros sociales del siglo XX. Susconsecuencias se han reflejado en todos los ambitos de la vida y han tenidorepercusiones en todos los niveles, especialmente en el linguistico. No muy atrasquedan los tiempos en los que la Real Academia Espanola definia las variantesfemeninas coronela como "la esposadel coronel" y medica como "la esposadel medico." La presencia de la mujer en profesiones que, hasta hacerelativamente poco, eran patrimonio exclusivo de los hombres ha generadodebates de gran interes. Uno de los mas recientes en...

Defines screws, explains their functions, and suggests simple experiments to demonstrate how they work.

On some days, seven-year old Julie feels like she's living in a Fun House. Hers is a topsy-turvy world where the toaster sprouts a toothbrush, and a watermelon gets dressed up in pink underpants for Fourth of July! But on other days, Julie struggles with understanding why her Halloween trick-or-treating got cancelled, or why Grandma can't remember her name. Julie is struggling with understanding her grandmother's Alzheimer's disease. Authors Max Wallack and Carolyn Given believe that no child is too young to learn about this disease, or how to participate in providing safe care for their...

GRADES K–2: Bring Spanish into the classroom! Introduce early elementary students to the topics of solar heat, light, and energy with this science-themed Spanish title. FEATURES: Kids will learn about how the sun's energy is harnessed, and complete an activity that supports further comprehension. EARLY BILINGUAL LITERACY: Help young learners strengthen their bilingual skills—add the English version of this title into your collection, too. WHY MY PHYSICAL SCIENCE LIBRARY: This collection introduces a variety of science topics while presenting complicated information in easy-to-understand...