Agujeros negros (Black Holes)

For many years, people believed there were nine planets that orbited the sun. Now we say there are eight. What happened to the ninth planet, Pluto? What are the different planets like? What exactly makes a planet a planet? These are the many intriguing questions answered with this high-interest book, crafted to be accessible for readers of all levels. Young astronomers will be especially fascinated by the stunning photographs and the "Make the Grade" fact boxes.

Based on the #1 New York Times Best-Selling series, this timeline of world history gives a fresh take on global events, from King Tut to Malala Yousafzai. Basada en la serie más vendida del New York Times, esta cronología de la historia mundial ofrece una nueva visión de los acontecimientos mundiales, desde el rey Tutankamón hasta Malala Yousafzai. For the first time ever, the Who Was? subjects are gathered into a single title! The Who Was? History of the World is a journey along the timeline of history, noting the birthdays of 150 people in the series and what was happening in the world...

In My Friend Has Down Syndrome, beginning readers are introduced to different characters who have Down syndrome, how Down syndrome may affect their actions, and how we can be good friends to people who have Down syndrome. Vibrant, full-color photos and carefully leveled text engage young readers as they discover how to empathetic and inlude all kinds of friends.

Un primer libro de conocimientos sobre los animales de granja. Con solapas, texturas e ilustraciones que nos muestran con detalle cómo es el conejo, el pollito, el cerdo o la vaca, entre otros animales y nos permiten descubrir cómo son, qué comen y cómo se llaman sus pequeños. ¡Para responder a las preguntas de los más pequeños!

Las cobijas no son calientes. ¿Entonces por qué nos dan calor? Descubre la respuesta y otras curiosidades del calor en este libro sobre la temperatura.