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The idea of evolution and that earth's species descended from common ancestors had already been around for some time when Darwin published On the Origin of Species in 1859. What was new about his work was that it explained evolution, using a theory called natural selection.

Charles Darwin called on a broad and unusually powerful combination of critical thinking skills to create his wide-ranging explanation for biological change, On the Origin of Species. It's one of those rare books that takes a huge problem - the enormous diversity of different species - and seeks to use a vast range of evidence to solve it. But it was perhaps Darwin's towering creative prowess that made the most telling contribution to this masterpiece, for it was this that enabled him to make the necessary fresh connections between so much disparate evidence from such a diversity of...

The Irish greatly contributed to the creation of the territory and state of Arizona due to their enterprising personalities and persistence in a difficult environment. The first documented Irishman in Arizona was Hugo O'Conor, who established the Presidio of Tucson for the Spanish government in 1775. Sheriff Bucky O'Neal of Yavapai County and the Brophy and Riordan families left their mark on Arizona's landscape as well as the Irish-born Sisters of Mercy, who established St. Joseph's Hospital in Phoenix. This photographic history identifies famous and lesser-known Arizona settlers who were...

Psychological vulnerabilities and environment influences are the most powerful forces shaping the behavior and choices of students to use harmful substances. This book employs computer-assisted Associative Group Analysis technology of comparative imaging and cognitive mapping to identify these factors and offers new perspectives for more comprehensive risk assessments and effective prevention.