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You can often find ecologist Nalini Nadkarni up in trees. She studies this unexplored ecosystem of the rain forest — the canopy. It's the world above the forest floor, all the way to the treetops.

It took decades, but John Coster-Mullen has pieced together specs for America's first nuclear bombs. Some believe his odyssey says something about North Korea's rapid nuclear progress.

Lightfoot is the city's first black female and openly gay mayor. After her swearing in, she laid out a plan to make Chicago "a city that families want to move to, not run away from."

Andy Purdy once was a top cybersecurity official for the U.S. government. He works now for the Chinese tech giant Huawei — heading their cybersecurity team in the U.S.

The Senate is beginning its trial after the House voted to impeach President Trump. Here is what you need to know about what led up to this moment and what the president is accused of.

America's lobbying against the brand has had limited success. Many countries in Europe, Africa, the Americas and the Middle East are continuing their 5G rollout with at least some Huawei equipment.

It was an intelligence community whistleblower who brought the matter to the attention of Congress. But insiders also recorded objections about what took place within the administration.

After a pandemic pause last year, the top brass of tech, media and markets descended in central Idaho for an annual gathering. This is what it was like to be there this year.

NPR's Noel King talks to Dr. Anthony Fauci, the nation's top infectious disease expert, about booster shots, vaccine equity among countries and what schools can do to start the academic year safely.

A president seeking re-election against a backdrop of a lackluster economy would be remiss if he didn't stress his unique roles as the nation's top policymaker for international relations and the military's commander-in-chief. President Obama and his campaign clearly intend to exploit those credentials for all they're worth while pointing out Mitt Romney's lack of them.