Rising concerns about housing affordability, racial inequality and climate change are causing cities nationwide to re-examine their attachment to the detached house.
The data underscores what testing experts have long emphasized: Income, race and privilege can influence a process that is supposed to be a level playing field.
Air pollution has improved dramatically over the past four decades, in a large part because of federal regulations. But many areas of the country still have high levels of pollution, and climate change may make them worse.
Americans have received billions of doses of vaccines for everything from measles to the flu. In 30 years, very few injury claims have been filed with the federal government.
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