Tras las huellas del ADN

Offers encouragement and practical advice for meeting challenges head on, with words of inspiration and fun, reminding girls to be who they are.

¿Por qué hay estaciones? ¿Por qué cambia el tiempo de una estación a la siguiente? Irene y su hermano Bruno tienen mucha curiosidad. Acompáñalos en esta aventura y descubre con ellos las respuestas a estas y a muchas otras preguntas que quizá también tú alguna vez hayas querido conocer. Conoce cómo cambia el tiempo según cada estación y cómo se adaptan las plantas, los animales y los seres humanos a esos cambios. Incluye una guía para los padres, con mucha información.

In order for any democracy to function well, understanding how and when to compromise is a necessity. This book introduces students to how compromise makes governing possible. Using examples of how compromise works in their own lives, students will gain a better understanding of how compromise work on a larger level. Conversely, readers will also learn that compromise may be the wrong course of action in some situations and that some issues are of such critical importance or high moral worth that standing firm is appropriate.

Who were the earliest Americans? When, how, and from where did they enter and spread across the continent? And what is their relationship to modern Native Americans? Anthropologists develop theories to answer these questions based on the evidence they discover. Their theories—and the discoveries that prove and disprove them—are highlighted in this fascinating volume, full of awe-inspiring facts and incredible breakthroughs. Readers will feel like anthropologists and archaeologists themselves as they read about bones and artifacts, and what they reveal about the ancient cultures that roamed...