http://en.wikipedia.org/wiki/Cohesion_%28chemistry%29 (5 years and 2676 days ago)
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(5 years and 2681 days ago)
fantastic
Rust is a general term for describing iron oxides. In colloquial usage, the term is applied to red oxides, formed by the reaction of iron and oxygen in the presence of water or air moisture (5 years and 2679 days ago)
(5 years and 2679 days ago)
http://en.wikipedia.org/wiki/Archimedes%27_principle (5 years and 2682 days ago)
wow, strong picture
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