Reigning Olympic gymnastics champion Simone Biles is out of the team finals with what USA Gymnastics described as a medical issue.

The delta variant “means trouble for people who never got vaccinated,” Health Commissioner Jan Malcolm told reporters. "The problem here is very much a problem of unvaccinated people getting exposed to an extremely contagious and dangerous virus."

Lakeville swimmer Regan Smith wins bronze in the women’s 100-meter backstroke.

Researchers from Minnesota and Wisconsin are trying to figure out precisely what has caused the recent spike in blue-green algae blooms in Lake Superior.

Japan's Naomi Osaka is out of the #TokyoOlympics  after losing on Tuesday in straight sets to Marketa Vondrousova of the Czech Republic in the third round.

Kindergarten enrollment fell 9% last year, and pre-K enrollment fell 22%. Now, schools are preparing for a year of unknowns: Should they brace for a surge if those students show up in large numbers?

Vaccinated people started hanging up their masks. Then along came the delta variant. And now people who are vaccinated are wondering: Are there circumstances in which a mask would be advisable?

The nation's top health agency is expected to reverse some of its masking guidelines and recommend that even vaccinated people wear masks indoors in parts of the U.S. where the coronavirus is surging.