Lo que los fósiles nos enseñan sobre la Tierra (Investigating Fossils)

Advances in science have changed our world, all thanks to the scientists behind important discoveries. Some of the most important discoveries have come from female scientists, who were as unique for their work as they were for being trailblazers in a male-dominated industry. This text offers a biographical treatment of such important scientists as Marie Curie, Rachel Carson, and Jane Goodall, as well as others who have made it possible for women of the future to have a career in science. Age-appropriate text, fact boxes, historical and modern images, and a comprehensive timeline complete the...

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...

Carlitos recibe la visita de lo que parece un fantasma: se trata de una señora que todas las noches se le aparece. No parece peligrosa, pero tampoco deja claras sus intenciones al manifestarse frente a Carlitos. ¿De dóndie viene, entonces? Su origen es un libro. ¿Y qué busca? A su hijo, que se perdió en el bosque, más allá del árbol guardián.

Juneteenth is usually celebrated on June 19. It honors the day in 1865 when Union troops swept into Galveston, Texas, and told the elated slaves there that they were free. This accessible volume delves into the American Civil War, the Emancipation Proclamation, and the events that led to this special holiday for African Americans and everyone who celebrates the end of slavery in the United States. Carefully chosen photographs reflect this special commemoration, both in the past and today.

Desde que el ser humano es tal, ha admirado, temido, incluso venerado a los animales. Esto tiene una explicacion: son una pieza clave en nuestra subsistencia como especie. Con excelentes fotografias e ilustraciones, el presente libro narra como nos hemos relacionado con los animales a traves de los siglos en los diferentes lugares del mundo. Book jacket.