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Birds descended from the dinosaurs, but researchers have known relatively little about how the bird's brain took shape over millions of years. A new fossil sheds light on that mystery.

In Pittsburgh, entire houses have been converted into individual art installations filled with unusual objects. A new house is now open.

President Biden and President-elect Trump met for almost two hours and discussed a funding bill that Congress needs to pass by Dec. 21, as well as ongoing support for Ukraine, the White House said.

A program in Brazil that gives a monthly cash sum to families living in poverty has an unexpected — and welcome result. A new study shows that it is dramatically reducing tuberculosis rates.

When Donald Trump returns to the White House, he's expected to issue a series of orders with far-reaching impact on global health — from abortion services to support for the World Health Organization.