Por qué Richard King es importante en Texas (Why Richard King Matters to Texas)

The sun is responsible for all life on Earth, but what exactly is it? Our star is an amazing force that can be as dangerous as it is important. From solar flares to the threat of blowing up altogether, the sun is one of the most interesting things in our solar system. Readers take a trip to the sun to see how it works and exactly what it is made of. Theyll learn about the life cycle of a star and see just how long we have until we have to find a new planet to call home. Dont worry, theyll be happy to learn that (hopefully) we have millions of years left!

Lo confieso: yo, Fabio MNZ, soy un loco de los enigmas sin resolver. Me encantan los misterios grandes, los misterios chicos... e incluso los que al final no son tan misteriosos. Así que a veces, si no hay algo raro, ¡me lo invento! Seguro que hay cosas que nunca te has planteado... ¿Existen los fantasmas? ¿Por qué los extraterrestres tienen la cara ovalada? ¿Quién se esconde detrás del Fabio que ves en tu pantalla? Pues yo sí me lo planteo a diario. Porque te voy a contar un secreto: todos los días me pasan cosas que no tienen explicación. MUY FUERTE, ¿verdad?

Describes the history, language, social classes, customs, culture, religion, and warfare of the ancient Central American civilization of the Mayas.

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!