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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.

The department sent letters to state leaders in Iowa, Oklahoma, South Carolina, Tennessee and Utah, warning that mask mandate bans could violate federal protections for students with disabilities.

It smells like vinegar and tastes like spoiled cider. But fans of the fermented tea say that kombucha helps fight off diseases and aging. Sounds fantastical? Well, it probably is. At this point, scientists still know little about kombucha's health effects.

U.S. disease detectives are launching a research project that health authorities hope will produce the most definitive evidence yet about whether the virus is really causing birth defects.

The government says thousands of vendors must pack up their wares, move off the streets and pay rent to sell from designated zones. The vendors say: How will we be able to earn a living?

The nation's poison control centers saw a 245% jump in reported exposure cases from July to August as more people take the anti-parasite drug that some falsely claim treats COVID-19.

In 1980, John Goodenough's work led to the lithium-ion battery, now found in everything from phones to electric cars. He and fellow researchers say they've come up with a faster-charging alternative.

Some of the reasons for the surge are expected — heavy rainfalls create lots of pools where mosquitoes can breed. But there are some surprising factors, like the Zika virus.

Kelly says his twin brother, Scott Kelly, who just returned to Earth after 340 days in space, was temporarily 2 inches taller. NASA is studying the pair to explore what spaceflight does to the body.

A federal judge says U.S. Education Secretary Betsy DeVos overstepped in trying to send more CARES Act money to help students at private schools.