Solemn ceremonies in New York City and across the U.S. are mourning the thousands of lives lost on Sept. 11, 2001. A new moment of silence at ground zero will honor those who have perished from illness because of the toxic dust they inhaled after the attacks. Follow live updates. https://trib.al/gZpNoDT

He was 10 months old when his mother was killed in the Sept. 11 attacks. At 25, he is learning to live outside the shadow of grief.

In @nytopinion 25 years after 9/11, “America faces another set of predictable attacks from two looming perils,” Philip Bobbitt writes in a guest essay. “Both stem from the emergence of artificial intelligence and its widespread availability to those who would harm the country.”

The writer Chimamanda Ngozi Adichie has moved countless readers with her novels about Nigerians at home and abroad. After the death in Lagos of her toddler son, her homeland no longer feels as much like home.

TSA PreCheck members may soon be able to bring larger bottles of water through security at select airports, in a major shift to longstanding rules.

In @nytopinion “Consumers should be able to buy clothes without contributing to the reckless degradation of the planet and the exploitation of their fellow humans,” Dana Thomas writes. “Fashion doesn’t need to be such an ugly business.”

Federal prosecutors have opened a criminal investigation into allegations that the Los Angeles Clippers helped arrange secret sponsorship contracts for the star player Kawhi Leonard that circumvented the salary cap, according to people briefed on the matter.

While much about ADHD is still up in the air, what has become clear is that it is not a static condition. The types of symptoms people have, and how they affect their day-to-day lives, can evolve over time.