The Sciences: An Integrated Approach, 3e is the only text on the market for the integrated science course. It integrates physics, chemistry, astronomy, earth sciences and biology for students with little or no science background. The new, third edition builds on the successful previous edition by incorporating changes that meet reform curriculum guidelines. Given the dynamic nature of the science disciplines covered in Trefil's text, updated content is critical. The new, third edition has thoroughly updated content throughout bringing the most up-to-date discoveries to the students in all five disciplines. its broad approach that covers such a variety of the science disciplines, updated content is crucial. This revision has several significant changes: URL's are included at the ends of each chapter, many of the Science News boxes are updated to show hot topics .