Image credit: Andrew Davidhazy, Rochester Institute of Technology
This is a Schlieren image (hi-res version), which reveals differences in the density of air around the candles. For more information, visit Schlieren Optics and Schlieren Photography Principles.
For more schlieren images, please see the Science Photo Library and search for "schlieren."
(This feature was updated on November 30, 2009.)
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Visit this site, Edison Invents!, for the story of Thomas Edison, produced by the Lemelson Center of the Smithsonian Institution. You'll find a pictorial history of his life, his bio, a matching game of his inventions, and even an activity to make a light bulb.
This feature was updated on November 30, 2009.