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Got a fan of snakes, lizards, and turtles? Dig into this beginner's guide to reptiles from Cathryn and John Sill, creators of the award-winning About... series. Author and educator Cathryn Sill explains in simple language the basic characteristics that all reptiles share, while offering a look at many of the animals that fall into this diverse category, including ever-popular lizards, snakes, and turtles. The beautifully detailed paintings of noted wildlife illustrator John Sill depict reptiles in their habitats and highlight their unique aspects. An afterword provides more detail on each...

On April 7, 1805, Sacagawea left Fort Mandan to begin the famous westward exhibition with Lewis and Clark. With over 100 black-and-white illustrations, Sacagawea's fascinating journey and life story comes to life in Spanish!

Un buen programador no solo escribe código sino que, además, incorpora en su día a día rutinas, trucos y actitudes que le permiten ser más productivo, más creativo y un profesional aún mejor. Repítelas y asúmelas como algo natural hasta convertirlas en hábitos y, solo entonces, habrás dado un salto de nivel en tu carrera. Lo único que distingue a un buen profesional de otro del montón, son sus hábitos. No es necesario trabajar muchas más horas, sino hacerlo con más eficacia, productividad y más concentrado. No generes software con tantos bugs sino que programa mejor con las...

This illustrated book for children and youths explores the design and history of telescopes, advances in telescope technology, and the structure of the space telescope Hubble. It also includes information on other telescopes like the Subaru, the Gemini, and robotic telescopes, and on observatories.