Science

NO2 Emissions in Can Undo Some Benefits of City Trees, Study Finds

A chemical reaction involving emissions from cars and buildings can negate their environmental benefits. New research shows what big cities can do about it.A chemical reaction involving emissions from cars and buildings can negate their environmental benefits. New research shows what big cities can do about it. Read More

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Matthew Perry’s Death Shines a Harsh Light on Ketamine Treatment

Was Mr. Perry, whose struggles with substance abuse were widely known, a good candidate for a drug used to relieve depression? Doctors say his case raises thorny questions.Was Mr. Perry, whose struggles with substance abuse were widely known, a good candidate for a drug used to relieve depression? Doctors say his case raises thorny questions. Read

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