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CETR: Tribological Testing Equipment and Service
CETR is the leading producer of equipment for tribological, hardness and friction testing, including Rockwell, Brinell, Knoop, and Vickers tests, as well as tribological research services.
http://www.cetr.com
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Science Directory
Hugh science directory with more than 100000 listed science related websites from around the world. Submissions for science related authority sites are free.
http://www.spacetransportation.org/
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Daily Optical Illusion
Optical Illusion Database Updated daily bringing you some of the best optical illusions on the internet. Scary Optical illusions video illusions, optical illusion pictures, eye tricks, jesus optical illusion and much more.
http://www.visualfunhouse.com
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