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The storm is forecast to intensify rapidly as it passes over warm water far out in the Atlantic, the National Hurricane Center says. It's too soon to predict where or when Sam might affect land.

Researchers with the Boulder Atomic Clock Optical Network Collaboration are one step closer to replacing the current atomic clock and officially redefining the second.

Public health experts are getting increasingly concerned that new COVID-19 hot spots may be emerging, especially in Michigan.

The computer model that predicts the weather is getting more power. Climate change is upping the stakes for forecasters as extreme weather gets more common and residents demand earlier warnings.

At least a dozen states have now seen an increase in COVID-19 hospitalizations. Epidemiologists explain what they think is behind the potential fourth surge of the pandemic in the U.S.

Obama's first announced stop is Philadelphia. He has largely stayed out of the race, but he did deliver a blistering warning about President Trump during the Democratic National Convention.

The hand recount, which will likely be both less accurate than a machine recount and more costly, must be completed by Friday, Nov. 20.

No matter who the next president is, Wednesday marks the official exit of the United States from the Paris Climate Accord.

The Tampa Bay Buccaneers celebrated their Super Bowl victory by holding a boat parade, despite the ongoing pandemic.

The blocked shipment of AstraZeneca COVID-19 vaccines was the first intervention by the EU since the bloc approved rules that could restrict vaccine exports to non-member nations.