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By 2060, new dementia cases per year could double to one million because of the growing population of older Americans, a study predicts.

On Monday night you may have a chance to witness the moon obscuring the Red Planet at its brightest, as well as a comet’s closest approach to the sun.

In its original form, the virus survives in just two countries. But a type linked to an oral vaccine used in other nations has already turned up in the West.

Extreme weather events — deadly heat waves, floods, fires and hurricanes — are the consequences of a warming planet, scientists say.

As many as two billion people suffer from it — including me. Can science finally bring us relief?

First came the Hadids. Then Bradley Cooper. Now, with luxury inns going up, the area around New Hope, Pa., has become a rival to the Hamptons.

In 1961, he and 12 other civil rights activists were nearly killed for trying to integrate interstate bus terminals across the South.

Air tankers, firefighters and technicians from the neighboring countries are on their way to Los Angeles in a show of solidarity.

Can a city lose an entire neighborhood now and simply shuffle on, dragging the local memory like a ghost limb?

President-elect Donald J. Trump has worked for years to discredit any and all criminal and civil cases against him as nothing more than politically motivated witch hunts.

Trump is likely to slash funding for women’s health organizations in the name of “protecting life” — but the result will be death.

California’s Democratic governor, Gavin Newsom, and President-elect Donald J. Trump have long feuded. Can the rancor be set aside to help a devastated city recover?

A reporter, an L.A. native, has watched movies and TV destroy her hometown for years, but nothing can prepare someone for seeing real devastation.

An image depicting a famous 19th-century painting of Cossacks, with current Ukrainian soldiers standing in for the warriors, has struck a chord as Kyiv battles to assert its identity.

The move allows hundreds of thousands of people from Sudan, Ukraine, El Salvador and Venezuela to stay in the country temporarily.

Lower courts ruled that a task force that determines which treatments must be covered at no cost had not been validly appointed.

After visiting President-elect Donald J. Trump in November, Mr. Zuckerberg decided to relax Meta’s speech policies. He asked a small team to carry out his goals within weeks. The repercussions are just beginning.

The historic ranch house of Will Rogers and an important residence by Ray Kappe were destroyed by the fires, which threaten L.A.’s spectacular design legacy.

Over 200 firefighters and emergency medical workers responded to the fire early Friday. There were no fatalities or life-threatening injuries.

California has focused on fortifying communities against wildfires. But with growing threats, that may not be enough.

As wildfires roar into residential neighborhoods, firefighters in California and elsewhere are finding that water systems can’t keep up with the demand.

The former beauty queen and spokeswoman for Florida orange juice was an all-American entertainer before she began crusading against L.G.B.T.Q. rights.