http://en.wikipedia.org/wiki/Cohesion_%28chemistry%29 (5 years and 2707 days ago)
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(5 years and 2711 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 2709 days ago)
(5 years and 2709 days ago)
http://en.wikipedia.org/wiki/Archimedes%27_principle (5 years and 2713 days ago)
wow, strong picture
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