Thomas Edison was short in stature, had blue eyes and white hair.
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if you look on radio telescope it looks very straight and finely tuned.
http://en.wikipedia.org/wiki/Heckler_&_Koch_MP5 there
A ghost image is one that you can look at. There are often ghost images that help people see what a puzzle should look like.
http://en.wikipedia.org/wiki/Electronic_symbol
Depends. A radiator in a car looks different from a heating radiator in a building. Which one?