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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.

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.

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.

Nepal became the third South Asia country to have its government toppled by protesters in recent years. Generation Z youth led the movement, which was triggered and shaped by social media.

Two years after the oil deal was signed, it collapsed — with the Taliban accusing the Chinese company of breaching the contract and some Chinese employees likening the Taliban's actions to robbery.

The National Institutes of Health, the crown jewel of biomedical research in the U.S., could face big changes under the new Trump administration, some fueled by pandemic-era criticisms of the agency.

For the director of the National Security Agency, Gen. Paul Nakasone, it means relentlessly tracking adversaries in cyberspace and increasingly taking action against them.