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Pfizer presented data to investors showing that a third dose of its COVID-19 vaccine boosts immunity. The company believes everyone will need a boost eight to 12 months after receiving a second shot.

"the outpouring love & support I've received has made me realize I'm more than my accomplishments and gymnastics which I never truly believed before," Biles said in a tweet.

A small Israeli study of vaccinated health care workers found that a handful who got infected developed headaches, muscle pain, fatigue and other symptoms of long COVID that lasted for weeks.

Reversing a decision made in May that allowed fully vaccinated people to ditch the mask, the Department of Defense will follow the CDC's most recent mask guidance.

The 24-year-old sprinter set an Olympic record in the blazing fast two-lap race, claiming his first-ever individual gold medal. It was a strong day in the pool for the U.S.

The settlement proposal is far lower than what families said they expected. But an attorney with more than 20 years of experience working with mass shooting victims says there's a lot to think about.

The underground musician always played by his own rules in a world he found ridiculous. Three years after his death, Sam Mehran's friends and family explain how they released his album, Cold Brew.

Weather-wise, it's been a disastrous summer. Scientists say climate change is driving deadly weather disasters around the world, as hotter temperatures produce deeper droughts and heavier rains.

About 300 unarmed soldiers are joining local police in the city of 6 million to enforce coronavirus restrictions as authorities try to quell a new outbreak linked to the delta variant.

The U.S. women's soccer team is advancing to the semifinals of the Tokyo Olympics after defeating the Netherlands in a tight match that went to a penalty kick shootout.