In Alaska, Commercial Aviation Is a Lifeline. The State Is Also Home to a Growing Share of the Country’s Deadly Crashes.

Correction, Sept. 15, 2021: This story originally misstated the dates of the Capstone program. It began in 1999, not 1996.

Some Hospitals Kept Suing Patients Over Medical Debt Through the Pandemic

Correction, June 14, 2021: This story originally misstated the time frame of the decline in legal actions that hospitals and health systems took to collect medical debt and, in a subheading, the degree of that drop. Actions declined by nearly 90%, not 92%, and the decline occurred in the first seven months of 2020, compared to 2019, not in the whole of 2020.

After NYPD Found “No Wrongdoing” in Officer’s Killing of Kawaski Trawick, a Watchdog Finds Fireable Offenses

Correction, June 12, 2021: This story originally misidentified which officer knocked on Kawaski Trawick's door and pushed it open. It was Herbert Davis, not Brendan Thompson.

The Government Is Here to Help Small Businesses — Unless They’re Cooperatives

Correction, June 7, 2021: This story originally misstated that lead was found in the drinking water in Flint, Michigan, in 2014. The contamination began in 2014, but it was discovered in 2015.

Hundreds of PPP Loans Went to Fake Farms in Absurd Places

Correction, May 20, 2021: Due to a geocoding error, a map with this story originally misplaced a loan recipient. It was in South Carolina, not North Carolina.

He Bought Health Insurance for Emergencies. Then He Fell Into a $33,601 Trap.

Correction, May 12, 2021: This story originally misstated when short-term plans were limited to three months. It was an Obama administration rule change, not part of the Affordable Care Act.

Trump Spawned a New Group of Mega-Donors Who Now Hold Sway Over the GOP’s Future

Correction, June 29, 2021: This story originally treated a father and son both named Roger Norman as a single person. The elder Norman is the one who gave an interview about gaining and losing fortunes. The younger Norman, who is in business with his father, is the one who donated to President Donald Trump.

The Child Care Industry Was Collapsing. Mrs. Jackie Bet Everything on an Impossible Dream to Save It.

Correction, May 17, 2021: ProPublica removed biographical details about mother Annette Ligon, who claimed to be practicing psychology, after learning that she had, under a different name, pleaded guilty to health care fraud; authorities said she had pretended to be a psychologist. When ProPublica brought this to her attention, Ligon said she had been vindicated but did not supply supporting documentation.

Florida Lawmakers Send Lifeline to Families With Brain-Damaged Children

Correction, April 30, 2021: This story originally misstated that the final bill removed language requiring NICA to act “in a manner that promotes and protects the health and best interests of children.” That language remains in the bill sent to the governor.

Texas Enabled the Worst Carbon Monoxide Poisoning Catastrophe in Recent U.S. History

Correction, Aug. 17, 2021: This story originally misspelled the name of Shalemu Bekele’s 7-year-old daughter. Her name was Rakaeb, not Rakeb.

“No Good Choices”: HHS Is Cutting Safety Corners to Move Migrant Kids Out of Overcrowded Facilities

Correction, April 1, 2021: This story originally misidentified the activities of the Texas Impact Foundation. It conducted a review of the Texas shelter system, it does not operate any shelters.

Documents Show Trump Officials Skirted Rules to Reward Politically Connected and Untested Firms With Huge Pandemic Contracts

Correction, March 31, 2021: This story originally misstated the honor awarded to retired four-star Army Gen. John Keane. It was the Medal of Freedom, not the Medal of Honor.

Biden Opened Temporary Legal Status to Thousands of Immigrants. Here’s How They Could End Up Trapped.

Correction, March 16, 2021: This story originally misstated the field in which UCLA’s Cecilia Menjívar specializes. She is a sociologist, not an anthropologist.

The Lost Year: What the Pandemic Cost Teenagers

Correction, March 8, 2021: Due to an inconsistency in data provided by the National Governors Association, an earlier version of this article misrepresented three states’ COVID-19 case thresholds for reopening schools.

“Power Companies Get Exactly What They Want”: How Texas Repeatedly Failed to Protect Its Power Grid Against Extreme Weather

Correction, Feb. 24, 2021: This story originally misstated the unit of measurement used in pricing electricity. Prices are in dollars per megawatt hour, not dollars per megawatt.

Text Messages Show Top Trump Campaign Fundraiser’s Key Role Planning the Rally That Preceded the Siege

Correction, Feb. 11, 2021: This story originally misidentified the name of Caroline Wren’s company. It is Bluebonnet Fundraising, not Bluebonnet Consulting.

The Climate Crisis Is Worse Than You Can Imagine. Here’s What Happens If You Try.

Correction, Jan. 25, 2021: This story originally misstated the title of a paper published by a team of 19 climate scientists. It is “Underestimating the Challenges of Avoiding a Ghastly Future,” not “Understanding the Challenges of Avoiding a Ghastly Future.”

Correction, Jan. 26, 2021: This story originally misstated the rate of the rise in temperature caused by global warming. The temperature will rise by a few tenths of a degree Celsius per decade, not by year.

Correction, Feb. 7, 2021: This story originally misstated Peter Kalmus’ age. He is 46, not 47.

Inside the Capitol Riot: What the Parler Videos Reveal

Correction, Jan. 18, 2021: This story originally misstated the location of the inaugural stands at the Capitol. They are on the west side of the building, not the east side.

New York City Paid an NBA Star Millions After an NYPD Officer Broke His Leg. The Officer Paid Little Price.

Correction, Jan. 15, 2021: This story originally misstated the first name of a New York City civil rights attorney. He is Joel Berger, not Joe.

Members of Several Well-Known Hate Groups Identified at Capitol Riot

Correction, Jan. 9, 2021: This story has been updated to remove the name of an individual who upon further investigation could not be definitively identified.