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.

Imagine traveling at half the speed of a jet plane without ever leaving the ground! Students will discover the technology that makes such speeds possible, from special tracks and safety precautions to aerodynamically designed trains. What are the limits to the speed of trains? What imposes those limits? Students also will read about the future of passenger train travel, from flying trains to trains that use huge magnets to levitate inches or centimeters off the track. Some trains safely reach speeds of more than 200 mph!

Animal keepers have developed innovative ways to help zoo animals learn and grow. Learn how zookeepers keep animals healthy and happy with this fun and informative book. Created in collaboration with the Smithsonian Institution, this STEAM book will ignite a curiosity about STEAM topics through real-world examples. It features a hands-on STEAM challenge that is perfect for makerspaces and that guides students step-by-step through the engineering design process. Make STEAM career connections with career advice from actual Smithsonian employees working in STEAM fields. Perfect for English...

The Spanish edition of award-winning picture book biography, CHEF ROY CHOI AND THE STREET FOOD REMIX, on the chef who kickstarted the food truck movement. "Parte biografía, parte aventura culinaria, este vibrante y energético libro capta la esencia de la escena de la comida callejera en L.A. Sus páginas están inspiradas en el arte del graffiti, y el texto tiene un sabor de hip-hop que mezcla la comida, comunidad, e identidad en un delicioso banquete para los ojos y orejas que refleja el crisol cultural de los Estados Unidos." -- Honor del Premio Sibert para el Libro Informacional Más...

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...