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The move to shorten the Pfizer booster interval comes as the U.S. shatters daily case records. The recommended interval for those who received Moderna or Johnson & Johnson vaccines has not changed.

The former president's campaign to get his vice president to overturn the election "was not just wrong," said Vice Chair Liz Cheney, a Republican, "it was illegal and unconstitutional."

The winning ticket was sold at a Publix supermarket in Neptune Beach, a town along the Atlantic Coast near Jacksonville. The jackpot was the third-largest in U.S. history.

A wailing siren sounded across Hawaii as the state tested its attack warning system.

A camera aboard a media boat captured the moment as the start neared — and unfortunately, it kept capturing the moment after the start signal blared, blocking roughly half of the racers.

Lake Tahoe's famed blue waters showed a modest increase in clarity last year, but researchers say the change is not significant enough to signal a long-term improvement.

Researchers have created a system where humans can guide robots with their brainwaves, signaling to the machines when they've made a mistake. It could help improve the way humans and robots interact.

Researchers say certain brain cancers tap electrical signals from healthy cells to fuel their growth. The finding could lead to treatments for deadly tumors like the one that killed Sen. John McCain.

Advocates worry this delay could signal a future attempt from the Trump administration to take grizzlies off the endangered species list.

Chinese Premier Li Qiang spoke this week at the World Economic Forum in Switzerland, saying the Chinese economy was doing just fine. Signals out of Beijing have been conveying a different message.