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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...

"Eran diez los mariachis. Ahora solo quedan nueve. Ay, caramba, ¿qué pasó? ¡La guitarra se rompió! Cuenta hacia atrás con esta simpática banda de diez mariachis."--P. [4] of cover.

Explains the basics of the most powerful machines around town and describes their major parts and functions, featuring dynamic photographs that will make little ones feel as though they are in the driver's seat.

Soy grande? ¿Soy pequeño? ¿Siempre soy el mismo? No es tan fácil saberlo, pues hay dilemas en la vida que a veces ofrecen información contradictoria. En Yo se exploran situaciones cotidianas de los niños en edad preescolar, con el fin de guiarlos en su descubrimiento de sí mismos y de su realidad, a partir de su entorno, sus emociones, necesidades y límites.