The document summarizes research on hair dryer design and history. It provides a timeline of hair dryer development from 1890 to present day. It also identifies common complaints with existing hair dryer designs such as being dull, heavy, expensive, and having cords that are too long. The document compares features of different existing hair dryer models and discusses hair dryer manufacturing processes and technologies like ceramic and titanium ionic technology. It provides links to additional information on how hair dryers work and anthropometric data used in hair dryer design. Research methods discussed include interviews and surveys.