México Tenochtitlan, El misterio del caracol

Young readers may have heard about the benefits of using and making the most of their resources, but how does that factor into an economic discussion? This thorough discussion defines resources and describes the different types of resources and why some divide them into three categories and others choose four. The book also addresses the concept of scarcity, showing readers how, because all resources have their limits, it is important to use them responsibly and efficiently in a healthy economy.

Describes The Technology Of Making Music By Either Singing Or By Playing Different Kinds Of Musical Instruments.

Daniel got the best birthday present in the world: his grandfather's magic briefcase! What tricks is it hiding? What surprises does it contain? Close your eyes and make a wish. This book is full of magic!

Un periodista investiga unos extraños asesinatos y descubre que están ligados a una profecía antigua de la cábala judía.