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64Uses Of Gemstones
Gemstones are very useful for the humankind. These stones have been used since time immemorial for ornaments and jewellry. Precious stones have been fixed on crowns of royals all over the world for thousands of year. In modern times also gemstones...
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73How to harness Sun's energy by making a solar concentrator
Visit this web page for detailed step-by-step construction method of a solar concentrator. If you need to work on your solar parabolic cooker project this is the article you should read.
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77How to fabricate a hydraulic jack
The first step in designing and fabricating a hydraulic jack is to understand how a hydraulic jack works. If you already know how a hydraulic jack works you can skip this section. Hydraulic jacks work on Pascal's law which states that "a change...
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