La antigua Roma (Ancient Rome)

Wind Power: A waving flag, blowing leaves, a kite soaring through the skyall are moved by wind power. Wind is also our fast-growing source of energy. Find out how wind forms and the different ways we may use it in the future.

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!

Everyone has to be responsible for themselves. Let's explore ways to show responsibility! 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.

An illustrated survey of the history and customs of the native North Americans who were members of hundreds of different tribes with varying lifestyles over the centuries.

¿Sueñas con jugar como Alexia? Una nueva aventura de ALEXIA PUTELLAS, balón de oro 2021, capitana del F. C. Barcelona y jugadora de la selección. ¡Para las superfutbolistas del futuro! Alexia sueña con ser futbolista profesional. Ahora que su equipo y ella han pasado a la siguiente fase del torneo, ¡la competición está más viva que nunca! El equipo que gane recibirá dinero para construir un campo de fútbol. Sin embargo, Alexia comienza a notar que a su alrededor pasan cosas raras: partidos amañados, jugadores asustados y una feroz rivalidad con Laia, la capitana del equipo...