National Eye Institute: Photos, Images and Video

www.nei.nih.gov/photo/

Created by the National Eye Institute (a division of the National Institutes of Health), this site is an online repository of images of the eye, eye diseases, research and clinical information.

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Introduction to Electronics, Signals and Measurements

http://ocw.mit.edu/OcwWeb/Electrical-Engineering-and-Computer-Science/6-071JSpring-2006/CourseHome/index.htm

From MIT’s OpenCourse program, this is an introduction to electronics, “designed to provide a practical – hands on – introduction to electronics with a focus on measurement and signals.”  Includes readings, lecture notes, exams and lab exercises.