Los derechos humanos

En la sala de los animales africanos de un zoo, hay un león, un avestruz y una cebra. Los dos primeros nacieron en cautividad, y a la cebra la cazaron siendo todavía una cría. No conocen otra vida más allá de sus diminutas jaulas. Pero pronto llega un compañero nuevo, el gorila, que sí ha conocido la libertad en África, adonde quiere volver a toda costa. Este animal les hace ver a los demás que viven encerrados, y les explica lo que es la verdadera libertad.

Saving and spending are building blocks of the economy. Readers will learn about various sources of income as well as concepts such as how saving a little at a time can eventually add up to a lot of money. This informational text explains ideas such as keeping track of expenses, financial goals, budgeting, and investing. Readers will learn about different types of savings plans, such as those for college and retirement. This resource also includes the ideas of donations and philanthropy.

For ages, the idea of machines that think and act on their own has gripped scientists, thinkers, and the general public. This book explores the history of artificial intelligence (A.I.), and how science fiction is quickly becoming science fact. It examines the technologies involved in A.I. and its inevitable effects on work, life, health, and many other aspects of human society. Rooted in history and science, this book provides an inside look at a topic that captivates engineers, scientists, and dreamers, but also raises important ethical issues and challenges how we see ourselves and our...

This guide gathers a selection of more than 500 species of vertebrate animals cataloged and arranged in colored illustration. It is an exhaustive and complete guide that provides precise information about each species, and that captures all the beauty and diversity of the vertebrate world in spectacular design and with enthralling visuals.