Lecturers explain what circadian clocks are, how they work and what relevance this knowledge may have for human health, also describing the scientific techniques used to discover the components of the circadian clock.

Special DVD features include: chapter search by scientific topic; animations and video clips; speakers' biographies and interviews; ideas for classroom activities. Lectures from Dec. 2000.

Biology in four dimensions /Joseph S. Takahashi -- Unwinding clock genetics / Michael Rosbash -- PERfect TIMing / Michael Rosbash -- The mammalian timekeeper / Joseph S. Takahashi.