Matemáticas en Marte (Math on Mars)

The asteroid belt between Mars and Jupiter is an intriguing area of our solar system. Scientists have counted over 670,000 known asteroids there, but there could be millions more not yet found. Readers will discover much more about the asteroid belt in this highinterest book, which blends science and math. They'll read about several topics, such as space missions to the asteroid belt and the difference between an asteroid and a planet, and solve associated math problems-just like actual space scientists do!

The American Civil Rights Movement of the 1950s and 1960s marked a shift in how African Americans were treated in the United States. This volume highlights the important events and figures that made this movement successful. The book introduces readers to important activists who fought for civil rights by raising their voices and refusing to accept unfair laws. Photographs and primary sources provide readers with a firsthand look at the history of the movement. Finally, readers will learn what can still be done to further equality for African Americans in the United States and how they can be ...

Essays by well-known climbers accompany a range of superb color landscape photographs that echo the great traditions of the Ansel Adams and the Sierra Club large format books of the 1970s.

Introduces the concept of opposites through pictures of a girl named Laura as she takes part in common daily activities.

«De vez en cuando me han pedido que contara mi experiencia personal de la literatura o que escribiera sobre algunos de mis maestros, y yo he procurado hacerlo siempre con un máximo de claridad y franqueza. Cuando he tenido que explicarme en público, he procurado hacerlo por escrito: detesto la improvisación, la charla presuntamente espontánea y en el fondo hecha de muletillas y rutinas, de una autoindulgencia intelectual que se ha convertido en costumbre cuando los escritores van a eso que se llama, algo ignominiosamente, hacer bolos.» Con ese mismo espíritu ‹claridad y franqueza‹...