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A series of unusual experiments in mice finds that dietary fiber fine-tunes the immune system and may help prevent chronic inflammation.

You don’t need fad diets, supplements, fancy workouts or lots of time or money to improve your health.

Attacking rampant drug abuse by trying to shut off the supply has not worked. We need to try a new approach.

A gelatin made from donkey hides is prized as a traditional Chinese remedy. Now slaughterhouses have opened in Africa, and domestic animals are disappearing from villages.

Before the 2016 election, those most likely to read “fake news” online were older and conservative, a new study finds. But even they relied most often on mainstream media.

The Crimson Tide cruised past Clemson, the defending champion, and will play Georgia in their sixth national championship game appearance under Coach Nick Saban.

The dominance of the league’s top six teams this season has led to a pattern of dull matches in which their opponents sit back and desperately try to defend all game.

Sony Michel’s 27-yard touchdown in the second overtime sent the Bulldogs to the national championship game.

Nine people from two families in New York and Florida were among the 12 people killed in the crash.

Mr. Martins had been accused of sexual harassment as well as physical and verbal abuse.

In spite of the cold, crowds turned out to be warmed by Bernie Sanders, who joked that “by Vermont standards this is a warm and pleasant afternoon.”

The former Fox News anchor, whose suit against Roger Ailes led to his departure from Fox, will be expected to lead the pageant through its own harassment scandal.

Join hands and see how centrifugal and centripetal forces define society.

The last year gave us some whopping deals, including Amazon.com’s acquisition of Whole Foods, that will shape the business landscape in 2018.

A superstar to crossword fans, Ms. Jacobson made more than 1,400 puzzles for New York magazine, filling them with puns and sparkling thematic clues.

The Oakland Raiders, Detroit Lions, Indianapolis Colts, Chicago Bears and Arizona Cardinals are looking for new leadership.

It was an oddly quiet end to a season of debate over the national anthem and N.F.L. players kneeling, sitting, raising fists and making other gestures during it.

Here’s what you need to know to start your day.

On a bitterly cold day, Bill de Blasio was sworn in by Senator Bernie Sanders and pledged “a new progressive era” for the city while looking beyond its borders.

Normally, presidents don’t matter much. But our normality is fragile.