Colorado's efforts are not enough to solve its ozone problem

A year after health officials issued a record number of alerts for high ozone levels on Colorado's Front Range, federal and state officials are trying to rein in the gas that can make outdoor activities a health risk.

New model offers physics-inspired rankings evaluation

The world is rife with rankings and orderings. They show up in tennis—as in the French Open, which ends with a final ranking of champion players. They show up in pandemics—as when public health officials can record new ...

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