PARIS — Five years after a fire that devoured its roof and nearly collapsed its walls, a renovated Notre Dame Cathedral reopened Saturday, its centuries-old bell clanging, its 8,000-pipe organ first groaning — and then roaring — back to life.

SAN FRANCISCO — For generations, the possibility of another devastating earthquake has lingered in the minds of Californians, who are remarkably familiar with seismological terms and regularly prepare for the next “Big One.”

TikTok is one step closer to disappearing in the United States after a panel of federal judges Friday unanimously upheld a new law that could lead to the banning of the popular Chinese-owned video app by mid-January.

TUKTOYAKTUK, Canada — On the shore of Lake Tiktalik in Canada’s Western Arctic, the thawing permafrost had set off two huge landslides into the water, leaving yawning craters on the tundra. These “thaw slumps” measured several hundred feet wide and just as deep.

The fatal shooting Wednesday of a top UnitedHealthcare executive, Brian Thompson, on a New York City sidewalk has unleashed a torrent of morbid glee from patients and others who say they have had negative experiences with health insurance companies at some of the hardest times of their lives.

WASHINGTON — NASA on Thursday postponed a mission to send four astronauts around the moon and back to Earth until April 2026.

WASHINGTON — Members of the Supreme Court’s conservative majority seemed ready Wednesday to uphold a Tennessee law denying transition care to transgender youth, with some of them saying that judgments about contested scientific evidence should be made by legislatures rather than judges.

TOKYO — When President Yoon Suk Yeol of South Korea visited the White House last year, he charmed the Washington establishment by singing Don McLean’s “American Pie.” When he flew to Tokyo to usher in a new era of conciliation with Japan, it was a genial visit, with the prime minister treating Yoon to “omurice,” a Japanese dish the South Korean leader likes.