Matter: Chlorine, Swimming Pool Helper, Has a Checkered Past

[unable to retrieve full-text content]In weapons and cancer-causing dioxins, chlorine can be a killer. But its threats today are nothing compared with its menace on the early Earth.

Source: http://www.nytimes.com/2013/05/23/science/chlorine-swimming-pool-helper-has-a-checkered-past.html?partner=rss&emc=rss

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