Desafíos matemáticos

A young boy travels to China to learn about the people and culture of one of the world's most powerful nations.

Beautiful illustrations translate into suggestive images the two faces of the sea?the calm and the wind?enabling children to understand the meaning of the words themselves.

Many desert animals around the world are in danger of becoming extinct. In this enlightening, Spanish-translated nonfiction title, readers will learn a few of the causes of extinction in the desert and what problems extinction causes for animals, wildlife, and humans alike. Through vibrant photos of beautiful animals and stunning facts in conjunction with informational text and useful charts and diagrams, readers will learn and understand concepts such as habit loss and learn ways that animal activists help to protect animals and their environments, as well as helpful tips to get involved in...

El joven Von Neumann y la ciencia europea de principios del siglo XX. Von Neumann y las matemáticas en Gotinga. Su pensamiento científico. En los Estados Unidos. La actividad científica en los años cuarenta y cincuenta. Von Neumann y la ciencia del siglo XX.