L.A. Times - Science

While a plummeting hormone level can trigger depression and irritability, experts say a modest decline can make men more invested, less stressed co-parents.

Scientists feared the Santa Monica Mountains' last endangered steelhead trout were wiped out by the Palisades fire. Then, they found them alive in Topanga Creek.

So far this year, the South Coast air basin, which includes Los Angeles, Orange, Riverside and San Bernardino counties, has seen 39 days when the concentration of lung-irritating ozone exceeded the federal standard, according to preliminary state air quality data.

Officials recently detected the flesh-eating New World Screwworm in a calf born in Texas. The once-eradicated parasite could tax a beef industry already experiencing increased prices. Will the discovery impact California farms?

A nationwide effort that includes many California researchers seeks to find out why some Asian American communities have high rates of certain cancers.

The object, called 3I/ATLAS, is only the third interstellar visitor ever detected passing through our Solar System.

The Pacifica Municpal Pier was abruptly closed Thursday after city workers found cracks and missing concrete. It's one more coastal landmark that has begun to crumble as the ocean slowly rises around it.

Can Silicon Valley solve California's mosquito problem? Google is seeking federal approval to unleash millions of bacteria-infected, non-biting mosquitoes in the Golden State.

A new dashboard makes public for the first time heat-related deaths and emergency room visits in near-real time.

A competitive contract isn't necessarily a bad thing, experts say. But the administration's anti-science record raises suspicion.

Facing higher premiums and the loss of federal subsidies, 374,000 Californians canceled their health insurance coverage in the first three months of the year.

Jose Manuel Perez trafficked reptiles worth more than $739,000 into the U.S. from Mexico and Hong Kong, using social media to make deals, according to federal officials.

Although many environmental experts praised the efforts of first responders, they remained skeptical that no toxic substances had been released.