Aging dams pose growing threat: UN

By 2050, most people on Earth will live downstream of tens of thousands of large dams built in the 20th century, many of them already operating at or beyond their design life, according to a UN University analysis.

Economist publishes research on traffic camera effectiveness

Between 300 and 400 cities in the U.S. employ traffic camera programs, according to Montana State University assistant professor Justin Gallagher. Even so, there has long been debate over whether the programs are effective ...

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