Elmina Aghayeva has 114,000 followers on Instagram and has seemingly never posted about politics, unlike other Columbia University students detained by immigration officers.

Federal agents do not have any special privileges on campuses. To arrest a student at Columbia University this week, they used a tactic of questionable legality.

Any Lucia López Belloza was deported by mistake. A judge ordered her return by Friday. When the Trump administration sent a plane, she decided not to get on.

Philosophers have long wrestled with what to do about the onlookers and profiteers surrounding those who have done terrible things.

At a gala in New York, the orchestra recognized two of his daughters, who are underwriting a scholarship to its academy.

President Trump’s approach is a revival of the mission of empire — acquiring the territories and resources of sovereign peoples.

The meeting comes after agents raided the home and office of Alberto Carvalho, the Los Angeles Unified School District superintendent. The F.B.I. also searched the Florida home of a consultant with ties to the schools chief.

Randi Weingarten, president of the American Federation of Teachers, and others respond to a Nicholas Kristof column. Also: Reagan’s warning about nuclear weapons; aging doctors.

Claire Shipman, the university’s acting president, said that the federal officials had misrepresented themselves to gain access.

Via essays, poems, videos, artwork and graphics, 35 students across the globe reflect on how this technology is affecting teenagers.

We asked high school educators what it’s like to teach at a time when A.I. is transforming education. They answered in images, essays and videos.

In two recent incidents, teenagers drove trains briefly, and in one case drove a G train into another train. A 14-year-old was arrested in that episode.

Republicans have embraced vouchers, while Democrats have criticized them. But as thousands of preschool parents vie for the funds, the state program may help a progressive goal.

Experts caution that low-quality, A.I.-generated videos on YouTube geared toward children often feature conflicting information, lack plot structure and can be cognitively overwhelming — all of which could affect young children’s development.