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In a three-minute video, Biden announced that he's running for a second term in the 2024 presidential race. The announcement comes four years to the day from the launch of his 2020 campaign

Democrat Barack Obama says he won't question the patriotism of others during the presidential race, and blames his own "carelessness" for some criticism of him. The speech is part of an effort to reassure voters about his commitment to the country.

Wednesday was the 34th anniversary of Phillipe Pettit's walk between the towers of the then-unfinished World Trade Center on a wire high above the ground without a net. Now a documentary film says it's time to remember the Twin Towers in a different way.

Russia escalates hybrid attacks across Europe, threatening infrastructure, civilians, NATO.

The EPA is the latest agency facing an uncertain future for its top official. Instability in Trump's Cabinet may have lasting repercussions for government departments.

The anesthetic ketamine first wowed the medical world with its ability to relieve severe depression in hours. Now it's showing promise for other psychiatric disorders, including bipolar and PTSD.

As 2017 comes to an end, check out what students had to say about the biggest education news of the year.

The country's top public health advocate says the cycle of opioid addiction won't be stopped without more money from Congress and cooperation among federal, state and local officials.

When Mary Jo and Mike Picklo bought their house in 2003, they expected to retire in it — until a coal mine opened across the street. They don't want it there, but they are nearly alone in their view.

As a patient, a critically ill doctor witnesses communication lapses, uncoordinated care and lack of empathy from her health care providers and vows to improve the patient experience for others.