Medir la velocidad (Measuring Speed)

Provides information on the tiny reptiles, including their use of color as a defense, their climbing skills, and their ability to grow back a missing tail.

Even before Christmas celebrations began, evergreen trees were used as part of winter festivals and celebrations. Today, many people still bring a real fir tree into their home at Christmastime, or an artificial tree that may come in any color including green, silver, or pink. Written with age-appropriate language and content, this book explains the symbolism behind our use of Christmas trees today and the many famous trees readers may know, including the huge tree at Rockefeller Center in New York City.

En su peregrinar por Japón, la fama de Musashi ha ido aumentando a la par que su creciente dominio del Camino de la Espada. Convertido en un espadachín ejemplar, los grandes señores del Japón feudal quieren emplearlo y hacer de él su siervo, convencidos de la tremenda valía de su brazo. Sin embargo, Musashi no es el único guerrero cuyo nombre está en boca de todos: como él, Sasaki Kojiro se ha hecho con una reputación sin parangón. Convertidos ambos sin discusión en los dos espadachines más importantes de su tiempo, sólo uno de ellos puede quedar como el más grande, en una...

Introduces the former Duke University basketball star, Grant Hill, who now plays for the Detroit Pistons.

As they say, necessity is the mother of invention, and this book introduces readers to 14 women who invented very useful, helpful items. They include Chicago native Margaret Wilcox who invented the car heater, Indiana native Marion O'Brien Donovan who invented disposable diapers, Pennsylvania native Stephanie Kwolek who invented Kevlar, and Austria-born actress Hedy Lamar whose secret communications systems led to the creation of WiFi, Bluetooth, and GPS.