En buena hora

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!

Me llamo Jackson y en otoño empezaré quinto de primaria. Cuando sea mayor quiero ser científico de animales. ¿Sabías que un guepardo puede correr a 110km/h? ¿Que una cucaracha sin cabeza puede sobrevivir dos semanas? ¿O que cuando un lagarto cornudo se enfada escupe sangre por los ojos? Honestamente, creo que los hechos son mucho mejor que las historias. No puedes ver una historia. No puedes sostenerla en tu mano para medirla. De hecho, las historias no son más que mentiras. Y a mí no me gusta que me mientan. La regla número uno de todo científico es que siempre hay una...

Learn About What Makes A Nation, Including Political Boundaries, Government Systems, Money, And Shared Traditions. Social Studies Based Leveled Readers For Use In Guided Reading And Social Studies Instruction.

Need it or want it — what's the difference? Needs are things people cannot live without, such as food, water, and shelter. Let's explore the differences between the concepts of needs and wants! The Me Pregunto (I Wonder) series is perfect for young learners in prekindergarten through grade 2. These 16-page books give readers an accessible introduction to nonfiction reading. Color photographs and fun, factual examples will grab the attention of young readers and help strengthen reading comprehension skills.