Un día de trabajo de un biólogo molecular (A Day at Work with a Molecular Biologist)

At an early age, Steve fell in love with the possibility of the computer machine. He knew it had the power to change someone's life. Inspired to create a personal computer accessible for everyone, Steve went on to become one of the most influential inventors the world has ever met. This inspiring story of the visionary and entrepreneur features a facts and photos section at the back.

Sofía and her friends accuse someone of theft based on his appearance, but when the truth comes out, they learn a lesson about passing judgment based on superficial traits.

Año de Nuestro Señor de 1209. Braira huye del exterminio de sus hermanos cátaros y se refugia en la corte de Aragón, bajo la protección de la reina Constanza, recién desposada con Federico II de Sicilia; un príncipe empeñado en llegar a ser el hombre más poderoso de su tiempo y ganarse el derecho a ser llamado Estupor del Mundo. Hasta su isla viaja la joven occitana, llevando consigo el secreto de su fe y una rara habilidad que pronto atraerá sobre ella la atención del monarca, convirtiéndola en protagonista de una trepidante sucesión de aventuras- el talento para interpretar las ...

No town or city could be built if the builders didn't understand the concepts of perimeter and area. Students will use perimeter and area to build towns and cities and design homes and parks in the book, Pueblos y ciudades (Towns and Cities). At home or in the classroom, this nonfiction book will engage students in learning measurement and geometry, and how to grid patterns, through fun practice problems and diagrams.