Here is a great piece on the Portland moss story on PBS News Hour, just out, with a great performance by our own Sarah Jovan. Plus I thought it was interesting to hear from many of the people involved in different aspects of the response to the study.
(Note, this is a corrected link updated a few hours after I first posted this)
http://www.pbs.org/newshour/bb/moss-revealed-undetected-air-pollution-threat-portland/
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