¡Mira, un tiburón! (Look, a Shark!)

Examines the nature of inclined planes and wedges, how they can reduce the amount of force necessary to perform work, and ways in which they are used.

Este práctico libro recoge muchas de esas preguntas que los pequeños de la casa (y a veces no tan pequeños) se pasan la vida haciendo a los mayores, y las contesta de un modo sencillo y muy divertido. Van acompañadas por unas simpáticas y originales ilust

Discover Dinosaurs Spanish Edition. Dinosaurs were reptiles that lived millions of years ago. It was a long time before there were any people on the earth. Scientists have looked at dinosaur bones and found out many things about what they were like. Nobody knows why the dinosaurs disappeared. People have made pictures to show what they might have looked like. What do we know about dinosaurs?

Discusses the difference between secrets that are fun to keep and those that make people unhappy, and encourages youngsters to confide in their parents or another trusted adult such painful matters as bullying or improper touching.