The first text of its kind, Biological PHysics synthesizes information from the developing field of biological physics. The text focuses on new results in molecular motors, self-assembly and single-molecule manipulation,integrating these topics with classical results. The text also provides foundational material from the emerging field of nanotechnology. Built around a self-contained core, the text is geared toward undergraduate students who have taken one year of calculus-based physics. Additionally, there are "Track-2" sections that contain more advanced material for senior physics majors and graduate students.