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When Kansas issued a mask mandate, 81 counties opted out. Researchers found coronavirus infection rates rose sharply in the opt-out counties, while falling in those that required masks.

With vote certifications this week in Pennsylvania, Michigan and Nevada, pressure will only build on the Republican dam of support for Trump's efforts to overturn the election results.

As cases surge, the FDA has approved two new antibody treatments that have shown promise in high-risk patients. Experts worry about Thanksgiving turning into a super-spreader holiday.

Just when you thought the world of wow couldn't get any weirder, Mindy and Dennis are painting eyes on cows' butts...for science! But WHY? Join Guy Raz, Mindy, and the gang as they uncover the Who, What, When, Where, Why, How, and Wow in the World of optical illusions and ambush predators!

Moncef Slaoui, the chief scientific adviser for Operation Warp Speed, says that some Americans could start receiving a COVID-19 vaccine by the second week of December.

The law calls for a recount to be conducted by retabulating every ballot through a scanner, the same way they were originally counted in the days following the Nov. 3 election.

A symbol of Lebanon's resilience through its long, turbulent history, the country's towering cedars now face increasing threats from wildfire and parasites, both fueled by global warming.

"Relationships with animals are simple," notes one researcher. In a year when life feels fraught, pets have been healers, helping human companions get exercise, quell anxiety and make new friends.

Allegations surfaced in a lawsuit this week that Tyson pork plant managers in Waterloo were betting on how many workers would get sick from COVID-19. Now, a local lawmaker is renewing his call for the governor to provide more information about her response to the meatpacking plant outbreak that infected more than 1,000 workers last spring, many of whom are immigrants and refugees.

As COVID-19 hospitalizations surge, new data released by the federal government show how many hospitals are struggling with staffing.