Agujeros negros (Black Holes)

For many years, people believed there were nine planets that orbited the sun. Now we say there are eight. What happened to the ninth planet, Pluto? What are the different planets like? What exactly makes a planet a planet? These are the many intriguing questions answered with this high-interest book, crafted to be accessible for readers of all levels. Young astronomers will be especially fascinated by the stunning photographs and the "Make the Grade" fact boxes.

Esta novela aborda el drama de la guerra civil y el de miles de pequeñas guerras civiles. Historias personales (una por cada víctima y verdugo) que tuvo lugar cuando la contienda terminó y se impuso un silencio que duró medio siglo, bajo el cual palpitaban el dolor, los remordimientos, los recuerdos…

Build early literacy skills, and develop oral and written language skills in emerging Spanish readers with this leveled fiction reader.

Un alegre recordatorio de que de que todos los niños son únicos y especiales de la mano del creador de El punto. Reynolds recuerda a los lectores que sean pacientes, tenaces y honestos. ¡Porque en todo el mundo solo hay un TÚ! Naciste para SER muchas cosas. Por dondequiera que te lleve la vida, recuerda... Ser curioso... Ser intrépida... Ser paciente... Ser valiente... Y, sobre todo, no te olvides de... ¡SER TÚ MISMO!

What did people use to buy things before money was invented? Where is money made? Find out in this inviting book that informs readers about coins, paper money, the Federal Reserve, exchange rates, and checking accounts. Featuring a timeline of moneys history, detailed photos, stimulating facts, clear, informational text, and a glossary that will assist in improving vocabulary, this Spanish-translated nonfiction title will keep readers engaged from cover to cover.