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Solar Filters for Binoculars
The Hydro Sphere
Making a green laser pointer a little bit safer
Telescope and DSLR Solar filter
Mod a Cokin P007 to fit into a screw-in filter
Crystallization of homemade sodium acetate
Introduction: Analyzing a Crystal Filter
Make red litmus paper
Cat litter box ventilation
Posted:Jun 4, 2009
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