What to Know About Friday’s Nationwide Ground Stop

The air traffic control system’s overloaded, antiquated telecommunications equipment sustained its latest widespread failure, prompting a call for more money to fuel faster upgrades.Passengers at Ronald Reagan Washington National Airport on Friday.

K Karoun Demirjian

Nvidia Scandal Prompts Questions of What It Means to Be a Spy

U.S. intelligence agencies believe a woman who had an affair with Jensen Huang was a Chinese asset. But there is much more that they are still assessing about her role.There remains much that intelligence agencies are assessing about Alice Huang, whose relationship with Jensen Huang has come under i

J Julian E. Barnes, Maggie Haberman and Jonathan Swan

What’s Behind the Trump-Huang Relationship?

President Trump’s show of support for Jensen Huang as he was under fire was a remarkable moment in a relationship that barely existed two years ago. Our White House correspondent Maggie Haberman explains how Mr. Trump came to see Mr. Huang as a modern-day Henry Ford.Jonathan Ernst/Reuters

M Maggie Haberman, John Pappas, Gilad Thaler, Thomas Vollkommer, James Surdam, Edward Vega and Nikolay Nikolov

The Jensen Huang Scandal Has Shocked Even Scandal-Prone Silicon Valley

As Jensen Huang abruptly departs, the tech community grapples with an eternal question: Why do the smartest and most successful men so often act so stupidly?The revelation that Jensen Huang had a romantic relationship with Alice Huang changed the chatter in Silicon Valley from soaring I.P.O.s to taw

D David Streitfeld

How the University of North Carolina Tried to Avoid Trump’s Wrath

The University of North Carolina’s chancellor tried to protect the school from the Trump administration. Work on cancer, suicide, AIDS and coronaviruses was hit anyway.Students crossing the campus of the University of the University of North Carolina at Chapel Hill in September.

A Alan Blinder, Stephanie Saul, Irena Hwang, Benjamin Mueller and Mike Belleme

Brooklyn Building Collapse Tragedy Devastates Immigrant Families

Theirs was a story as old as New York. On a street in Brooklyn, immigrants had arrived to work and live, until their lives intersected in tragedy.Brenda Vasquez, 25, lost her husband, Edgar Santiago Sapón Gutierrez, 26, when an apartment building collapsed onto a Brooklyn construction site.

L Luis Ferré-Sadurní and Ana Ley

Developer Avoided Stricter Oversight Before Fatal Building Collapse

By winning approval for a three-story building, then seeking to add more stories, the Brooklyn developer was not subject to the more rigorous oversight required for larger projects.A site on Bedford Avenue in Brooklyn was under construction when a neighboring building collapsed.

S Stefanos Chen, Mihir Zaveri, Amy Julia Harris, Bianca Pallaro, Dionne Searcey and William K. Rashbaum