Energía del viento

Defines screws, explains their functions, and suggests simple experiments to demonstrate how they work.

Follows the life and career of the French scientist who proved the existence of germs and their connection with diseases.

Defines levers, explains their functions, and suggests simple experiments to demonstrate how they work.

This title will introduce little readers to the 1st president of the United States, George Washington. Readers will gather basic, biographical information about Washington through easy-to-read, simple text. They'll also love the historical photographs and images, the More Facts section, and bolded glossary terms. Translated by native Spanish speakers. . Aligned to Common Core standards and correlated to state standards. Abdo Kids is a division of ABDO..

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...

Planck consideró como tarea científica suprema la búsqueda de las leyes que rigen el absoluto, el invariante oculto en la realidad externa. Le cupo el privilegio de descubrir uno de esos elementos universales: el quantum de acción, la constante h.

Surveys the life of Swiss/German immigrant John Sutter, on whose land gold was discovered in the mid-nineteenth century, spurring the California gold rush and westward expansion.