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{{engineering|class=start|importance=low}}
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== Why only particles of micrometer sized scale and above? ==
It seems very strange to me why there should be a limit at the micrometer sized scale. I put a {{tlf|fact}} tag after that sentence. Discussion for the tag goes here. —[[User:Kri|Kri]] ([[User talk:Kri|talk]]) 14:14, 20 August 2012 (UTC)
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