Las Mujeres en la Química

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...

In Bosques, carefully leveled text and vibrant, full-color photographs take beginning readers on a tour of a temperate forest. Readers learn about this important ecosystem and the variety of living things adapted to live there.

Texas has long been associated with two main industries: cattle and oil. Learning about these businesses is valuable as their development coincides with the growth of the state of Texas, and a boon in America’s economy as well. Additional features, such as an interactive reader response panel, make this topic a joy to explore.

"Mi enfermedad me ha hecho vivir etapas difíciles y he tenido que pasar por muchos momentos tristes. Pero todos estos instantes me han enseñado a valorar las cosas de verdad: estar con las personas que me quieren y luchan para hacerme feliz, disfrutar de cada instante, avanzar y no rendirme nunca. Si en tu vida mantienes la esperanza, disfrutarás de una vida fantástica."