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| Spacetransportation.org - http://www.spacetransportation.org/
Hugh science directory with more than 100000 listed science related websites from around the world. Submissions for science related authority sites are free.
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| Gears and Gearing - http://www.gearinfo.com
Learn all about gears. Read articles on different kinds of gears and gear technology.
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| Oscilloscope - http://www.xraygadgets.com
All about oscilloscopes.PC, digital , Handheld and probe.
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| Binary Number System - http://www.BinaryMath.info
All the basics to binary mathematics, arithmetic operations in the binary number system, and decimal and binary conversions. Practice exercises with answers, free online converters, and more.
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