He Studied How Emissions Are Heating Up U.S. Cities

“Fundamentally, we were trying to learn about these systems to prevent people from dying unnecessarily from heat,” said Kevin Gurney, an atmospheric scientist.

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How the N.Y.P.D.’s Facial Recognition Tool Landed the Wrong Man in Jail

Trevis Williams is eight inches taller than a man accused of flashing a woman in Union Square in February. The police arrested him anyway.

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As Marijuana Use Grows, Effect on Road Safety Remains a Blind Spot

Scientists want to create breathalyzers that show how recently a driver used marijuana. Researchers also are studying how cannabis impairs motor skills and reflexes for habitual and occasional users.

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