Lo Que Necesitamos Y Lo Que Queremos

"Simple text and photos present the seasonal weather cycle and activities to do in each season"--Provided by publisher.

Introduces different kinds of light, the properties of light, and how light can create shadows of different shapes and sizes.

Practice time measurement by timing races! Racing is all about having the fastest time, so accurate time measurement is very important for athletes! Young readers will learn all about how athletes measure racing times and will practice their mathematical and STEM skills. The Spanish-translated text, vibrant images, fun practice problems, and helpful mathematical charts in this title make time measurement seem exciting and simple!

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!

A young boy tries to help his younger brother, whose mind and body has become occupied by another boy, a young soldier in Saddam Hussein's army during the Persian Gulf War.

Acércate a mirar un mundo fascinante que con frecuencia se oculta a la vista. Los bichos están en nuestro entorno, pero ¿qué sabemos realmente sobre ellos? En este libro se revela la vida secreta de esos pequeños animales: cuándo y cómo evolucionaron, qué aspecto tienen, cómo funciona su organismo, dónde viven y cuál es su comportamiento.