Meanwhile a couple of news and image-sharing websites, Reddit and 4Chan, have been overrun with users trying to do their own parallel investigation. Amateur digital-forensic analysts are going through much of the same data as investigators, circling suspicious people in backpacks and swapping theories about who did it and how.
A new report out from the California Air Pollution Control Officers Association finds that air quality statewide has improved over the past 12 years. For more on this and on an interesting study on how pollution travels, we're joined now by Suzanne Paulson, a professor at UCLA's Department of Atmospheric & Oceanic Sciences
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Reviews of the week's new movies, interviews with filmmakers, and discussion.
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