In each of these cities, adding green space to crime-ridden areas helped reduce crime rates, the researchers found.

研究人员发现，在这三个城市中，在治安糟糕的区域增加绿化面积可以有效减少犯罪率。

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Last month Jennifer Doleac, assistant professor of public policy and economics at the University of Virginia, published a paper entitled The Effects of DNA Databases on Crime, which suggested that size matters: "larger DNA databases reduce crime rates".

BBC: DNA and individual freedom v crime prevention