After promising data, experts say many questions remain over an experimental Alzheimer's drug

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This undated electron microscope image made available by the U.S. National Institutes of Health in February 2020 shows the Novel Coronavirus SARS-CoV-2, orange, emerging from the surface of cells, green, cultured in the lab. (NIAID-RML via AP) This undated electron microscope image made available by the U.S. National Institutes of Health in February 2020 shows the Novel Coronavirus SARS-CoV-2, orange, emerging from the surface of cells, green, cultured in the lab. (NIAID-RML via AP)

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Putin calls nuclear weapons a tool of deterrence in Ukraine

Russian President Vladimir Putin on Wednesday hailed the annexation of Ukrainian territories as a major achievement and said his country's nuclear weapons serve as a tool of deterrence in the war that the Kremlin calls a 'special military operation.'

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