Experimentos para todas las edades

"Some things are so huge or so old that it's hard to wrap your mind around them. But what if we took these big, hard-to-imagine objects and events and compared them to things we can see, feel and touch? Instantly, we'd see our world in a whole new way." So begins this endlessly intriguing guide to better understanding all those really big ideas and numbers children come across on a regular basis. Author David J. Smith has found clever devices to scale down everything from time lines (the history of Earth compressed into one year), to quantities (all the wealth in the world divided into one...

Bacteria have a slimy reputation. They're too small to see with the human eye, so it's easy to let them slip past unnoticed. But, bacteria are part of our daily lives. In fact, they affect everything from milk to our moods. Get ready to zoom in on the hidden world of bacteria and explore the many ways that bacteria are being used in the modern world. This nonfiction reader seamlessly integrates the teaching of math and reading, and uses real-world examples to teach multiplication of mixed numbers. Text features include images, a glossary, an index, captions, and a table of contents to build...

Estás creciendo y en tu cuerpo se producen cambios, este libro te ayudará a entenderlos. Si eres una chica: llega la menstruación, tus pechos se hacen notar, aparecen pelos y te quieres depilar. Si eres un chico: te sucede algo desconocido mientras duermes, descubres nuevas sensaciones, transpiras mucho y no te quieres bañar. La licenciada Alicia Guzmán te cuenta cómo es esta etapa única del crecimiento, maravillosa y a la vez difícil: la pubertad. Con los dibujos de Petisuí sonreirás como quien se mira al espejo. Autora: Alicia Guzmán

"Carlitos writes a letter to the Three Kings asking for lots of presents. Later, he decides to write a new letter and gives up some of the things in his wish list in exchange for a bigger gift for his older brother, who is teaching him how to ride a bike and lets him use his own big kid's bike. At the end, everyone wins...! Contains an informative section about Christmas and Three Kings Day."