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The invasion of Ukraine occurred despite weeks of diplomatic efforts, including calls between President Biden and Russian President Vladimir Putin and European leaders' visits to Putin in Moscow.

Ukraine's U.N. Ambassador Sergiy Kyslytsya delivered a charged address at the Security Council, demanding the Russian representative phone Moscow to call off the war.

The consensus has been that Pfizer and Moderna are most protective. But a study looking at 5 vaccines — including Russia's Sputnik V and two Chinese types — offers an unexpected finding.

Some lawmakers worry that pushing future post office retirees' health costs to Medicare could hurt the health program's outlook.

The organizers of the Eurovision Song Contest 2022 say they will allow Russia to participate in this year's competition, despite the invasion of Ukraine, but that they will "monitor the situation."

A new study suggests reopening schools may be safer than previously thought, at least in communities where the coronavirus is not already spreading out of control.

Power outages are increasingly common, putting everything from clean drinking water to medical equipment at risk. Some communities are installing solar power and large batteries to protect themselves.

Exposing people to a potentially fatal disease could hasten understanding of COVID-19 and development of new vaccines and treatments. But the risks of such studies raise serious ethical questions.

President Biden's education nominee has spent most of his professional career as a public school educator in the city where he grew up: Meriden, Conn.

The FDA will likely make a decision about approving Pfizer's vaccine "shortly after" an advisory committee meeting on Thursday. The agency has found "no specific safety concerns" about the vaccine.