Light City 2017 to feature Biz Markie and Dirty Dozen Brass Band, new art installations

A sample at the Highland Park lab

In this sample at the Highland Park lab, the small bubble-like growths on this filter indicate atypical bacterial growth from a presumptive test. In a normal circumstance, this would be swabbed and incubated for a confirmatory test that would indicate fecal or total coliform.
Gregory Trotter, Chicago Tribune
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