Abdul El-Sayed’s Senate candidacy poses a critical challenge for Democrats’ ascendant progressive wing: Can an insurgent candidate, with unabashedly liberal positions, win a general election in a moderate state?

The federal government is ending its contract with a Kentucky nonprofit that it says pressured medical workers to remove organs from patients who were getting better.

The death of a Salvadoran immigrant at the federal detention center in Newark has raised questions about the conditions there.

Why we keep searching for new ways to explain ourselves.

In 32 of the countries included in a recent study, at least a quarter of the native butterfly species had moved to new areas.

No one doubted the intensity of Lobga Rangzen’s commitment to a Tibet free of Chinese control. But they were not prepared for what he did next.

Amateur and professional astronomers pointed their telescopes at the impact site. Most did not detect anything.

The Mediterranean archipelago is a hot destination for U.S. companies seeking to shield profits from income taxes.

A proposal making its way through Congress would integrate the U.S. and Israeli defense and intelligence apparatuses more tightly. Some worry that it is a bad idea.

Federal and state officials are racing to address an assault on the nation’s water supply that they believe is the work of Iranian hackers.

Forecasters expect winds to pick up in eastern Washington and Oregon on Friday and Saturday, but not to be as strong as last weekend’s were.

The agreement on an acceptable route for ships to pass through the strait would effectively ratify Tehran’s control over the crucial waterway.

In a new tactic, federal immigration officials recently started saying they would criminally charge the elected county sheriffs in Minneapolis and Chicago.

An episode this week focuses on the dangerous effects of warming, without mentioning climate change.

We’re also looking to find out what questions solvers have about the game.

A knife-wielding masked man. A pig’s head outside his parents’ door. Running 30 marathons in 35 days. The Cambridge professor Jason Arday, accused of plagiarism, says he’s been through it all. Not everyone believes him.