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The nation's aviation infrastructure is again under scrutiny, following a series of paralyzing communications and radar outages at some of the country's busiest airports. Here is a look at the scientific origins of radar.

Russia launched a deadly strike on the Ukrainian capital of Kyiv. Trump says he wants peace quickly. And, NPR looks inside Sudan's capital city of Khartoum after two years of war.

Amid an uneasy tenure that saw the failure of an Obamacare repeal and the passing of tax cuts — as well as an uneven relationship with President Trump — Ryan is calling it quits.

Celebrations included a massive military parade in Moscow's Red Square, where Russian President Vladimir Putin hosted several foreign leaders, including the presidents of China and Brazil.

On May 30, a team of researchers funded by the National Institutes of Health got the word: Funding for their vaccine development program will end next year.

President Trump doubled down on his claims that the U.S. strikes in Iran last weekend "obliterated" its key nuclear facilities. But experts say that regardless of the amount of damage done to Iran's nuclear facilities, deliberate negotiations leading to a lasting agreement are crucial to prevent the resumption of war.

Americans forfeit millions of paid days off every year. And many U.S. workers now take shorter, partial-week vacations. But even a mini-break can be good for your health.

Deconstruction is a growing approach to taking down homes that diverts waste from landfills, cuts carbon emissions and creates a circular economy for construction materials.

Ukraine's president was elected with a huge popular mandate to fight corruption. The youngest and least experience member of Ukraine's parliament has joined the battle against corruption.

"It feels like we're not being considered and we're not being included," says survivor Annie Farmer, who testified against Jeffrey Epstein and Ghislaine Maxwell.