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Like many cities, Denver's largest source of greenhouse gas emissions is its buildings. Heating and cooling skyscrapers requires a lot of fossil fuels. Now, the city is trying a surprising solution.

FAA Administrator Bryan Bedford faces tough questions from lawmakers about the state of the nation's air traffic control system and its efforts to increase staffing.

States are phasing in major changes to food assistance. We hear from people who are feeling the impact and from Ty Jones Cox of the Center on Budget and Policy Priorities.

A look at primary results from around the country, Trump and Vance share conflicting messages on state of Iran war, shooting at San Diego mosque being investigated as possible "hate crime."

President Vladimir Putin is in Beijing for talks with President Xi Jinping, in a closely watched visit that comes just days after President Trump's high-profile trip to China.

The announcer of "Wait Wait... Don't Tell Me!" --- the revered journalist Bill Kurtis -- has retired. His final show airs this weekend. NPR's A Martínez speaks with Kurtis about his career.

Restrictions on mining for precious metals like gold in Montana that were put in place 30 years ago could soon be relaxed as the mining industry makes a comeback in the U.S.

A new report finds that global humanitarian aid is failing, with cuts from major donors like the United States and increased attacks on health workers further eroding the system.

Eleven historically significant sites across the country will receive $25,000 from the National Trust for Historic Preservation to commemorate the country's 250th anniversary.

President Trump and the White House are sending conflicting signals about the state of the Iran war and the negotiations intended to end it.

NPR's A Martínez asks Vali Nasr of Johns Hopkins University what a potential restart of military strikes against Iran would mean for the U.S. and its regional partners.

Authorities say a deadly attack on a mosque in San Diego may be a hate crime. Online materials believed to be tied to the shooters appear to fit an established category of white supremacist violence.