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New research reveals an intriguing connection between low levels of the chemical serotonin and the brain fog seen in some long COVID patients. The findings point the way to one possible treatment.

Argentinians took to the streets seeking answers about the murder of a political activist who had disappeared. The country hasn't forgotten how thousands disappeared during the military dictatorship.

The ceasefire in Gaza ended on Friday. While Israel says they're making progress against Hamas, civilians in Gaza are struggling to find safe places to take refuge.

The airline has been operating for more than 75 years, and it's become Africa's largest airline in terms of destinations, passengers carried and revenue. It suffered a blow with a deadly crash.

During a difficult point in her life, Mary Griffis bought a manual car. After she picked it up, she stalled out in heavy traffic on a narrow road. One driver showed her kindness that others didn't.

Ethics watchdogs are preparing for their lawsuit alleging President Trump is violating the Constitution's foreign emoluments clause. But this renews the controversy over what defines an emolument?

Move over, Mariah Carey: Brenda Lee's reliable holiday hit, first released during the Eisenhower administration, is the No. 1 song on the Billboard Hot 100 — for the first time ever.

The beverage-first McDonald's spinoff, named for a six-handed extraterrestrial, seems to be a grab at markets currently served by the likes of Starbucks and Dunkin' Donuts.

The microbes that inhabit our bodies evolved with us for millions of years, providing new evidence of the symbiotic role our bacteria play in our lives.

University of Baltimore law professor Charles Tiefer worked in a congressional investigation of the Iran-Contra scandal. He tells Don Gonyea what goes on behind closed doors.