Einstein's theory of special relativity includes electricity and magnetism in a simple, logical extension of the relativity of Galileo and Newton. Its conclusions, including time dilation, length contraction, and E=mc2 have changed profoundly our ideas of time and space, matter and energy. These multimedia modules (click on menu above right) give a brief overview of relativity - they present the main ideas. Inevitably, you will have questions. So the related links (below) give more complete explanations, at levels with ( ) or without mathematics ( ). Animations from Einstein Light require the Flash 6 Plugin. The multimedia modules have animations and film clips and are typically 2Mb. The much smaller HTML versions have only text and images. (If your connection is slow, you might read some of the background links while the modules load.) Related Links for each module:-