Memorias de alta mar

A simple biography of the naturalist who founded the Sierra Club and was influential in establishing the national park system.

Andrés Haraldsen Perestrello acompaña a Colón como secretario. En su compañía seremos testigos de grandes acontecimientos históricos - la conquista de Granada y el descubrimiento de América.

A retelling, in graphic novel form, of the myth of the Trojans who discover a gift of a giant horse from their Greek enemies.

Readers won't have to disassemble their favorite toys to discover what makes them work. This book explores electric, magnetic, and motion-powered toys from design to function. It introduces readers to the six simple machines and explains how they use force and motion to do work. Not every toy is a technological marvel. Readers learn about time-honored favorites including the rocking horse, Slinky, and rattles.