Una Luna

In 1991, preparation for the construction of a new federal office building led to a startling discovery: a skeleton. Further excavation exposed the bones of 420 men, women, and children. This area of New York had been a burial ground set aside for both free and enslaved Africans during the 1600s and 1700s. It’s thought to be one of the most important archaeological discoveries of the 20th century. This noteworthy book—which includes sidebars, fact boxes, a timeline, and maps—fills in the gaps of history books, exposing much about what life was like in colonial New York for Africans.

The nineteenth century was a time of huge growth and prosperity for California. Although the Gold Rush lasted only seven years, California provided other opportunities for those who emigrated there in search of a better life. This Interactiv-eBook focuses on the history of San Francisco, Los Angeles, Sacramento, and Fresno, and the people and events that influenced their transformations from small towns to booming cities. This nonfiction text builds literacy and social studies content knowledge through the use of intriguing primary source documents like maps, letters, images, articles, and...

Sesenta autores, desde catedráticos de universidad hasta estudiantes de Secundaria y Bachillerato, nos presentan los cuarenta desafíos que la Real Sociedad Matemática Española propuso con motivo de su centenario.Son cuarenta estimulantes retos que avivan el ingenio. Enfrentándose a ellos, el lector se sentirá un auténtico investigador matemático.Pero no hay que asustarse. No es necesario saber muchas matemáticas. La herramienta esencial para resolver los desafíos es pensar ordenadamente.

Science and safety come together in this very simple book illustrated with bright cut-paper pictures.