¿De quién son estas rayas?

Practice data analysis while learning about endangered species! This title allows young readers to improve their understanding of data analysis and graphing methods, teaching them about probability and STEM skills through bar graphs and pictographs. This book includes engaging examples of wild animals who are endangered species, teaching readers about their habitats, their greatest threats, and their predicted populations. Vibrant images, exciting examples, and clear mathematical diagrams and charts engage readers while making them more confident in their data analysis skills.

Esta serie cuenta con un grupo de pequeños extraterrestres guardianes de la naturaleza que salen de su planeta en la búsqueda del mayor contaminador del universo, el perverso Zirt Zlunder. El se escapa y viene a vivir en el planeta Tierra. Este libro empieza, la saga de los Pequeños Guardianes alrededor del universo detrás del temible Zirt Zlunder, el mayor contaminador de todas las galaxias. Ellos le persiguen en un intento de detener a Zirt Zlunder antes de que llegue a Tierra para contaminar aún más nuestro planeta.

Planck consideró como tarea científica suprema la búsqueda de las leyes que rigen el absoluto, el invariante oculto en la realidad externa. Le cupo el privilegio de descubrir uno de esos elementos universales: el quantum de acción, la constante h.

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!