A staple in laboratories worldwide, C. elegans is “an experimental dream,” said one scientist.

A bill introduced in the House of Commons could legalize assisted dying for the terminally ill, under strict conditions. A similar proposal was rejected in 2015.

Pentagon officials discuss whether the flow of assistance could be hurting the military’s ability to respond to a new conflict.

The settlement is the highest single payout by an archdiocese, experts said, and brings Los Angeles’s cumulative payout in sex abuse lawsuits to more than $1.5 billion.

The glowing works from Siena, now at the Met, are revelatory for their emotional intensity and 24-karat beauty.

Mary Barra, G.M.’s chief executive, said that the company had fixed battery-manufacturing problems and that its electric vehicles would soon be profitable.

Gen. Abbas Kamel, a longtime confidant of Egypt’s president, oversaw the country’s most important international relationships and helped maintain the president’s authoritarian grip.

Future Forward has ascended to the top of the Democratic political universe, but it has also drawn suspicion and second-guessing.

The program, which provides free groceries to millions of women and children nationwide, now covers naan, soy milk, teff and more.

The findings of a review of the attempted assassination of Donald J. Trump in July are stark but familiar, underscoring the challenge of overhauling the agency.

The people in Riegelsville, Pa., expressed two shockingly different visions of what a president should be.

Policymakers who set interest rates for the 20 countries that use the euro have lowered rates in back-to-back meetings for the first time since 2011.

Mr. Sinwar, one of the main architects of the Oct. 7 Hamas-led attack on Israel, has spent decades with the militant group, working his way to the top of its leadership.

A bridge over the Strong River in Simpson County that was being demolished collapsed in a “work site accident,” the authorities said.

In the House of Mirrors, political captives were pushed to the brink of insanity and death. Some are telling their stories now that the woman who put them there, Sheikh Hasina, is gone.

The combination of an aging work force, artificial intelligence and shifts in globalization will challenge America in ways not seen in decades.

In a town hall that Univision broadcast on Wednesday night, Donald J. Trump did not directly answer many frank questions on climate change, immigration, abortion rights and other topics.

The U.S. has the capacity to address its biggest problems. Whether it does is a different matter.

Plus, One Direction’s Liam Payne dies at 31.

Jilly Cooper, 87, has written raunchy novels for decades. Adapting her 1988 book “Rivals” for the streaming age meant tweaking some details.