Science

The comet, 2I/Borisov, looks surprisingly like comets closer to home. It's a sign that the processes that formed the sun and planets are at work elsewhere in the universe.

A mysterious die-off of freshwater mussels has biologists scrambling to figure out a cause. Freshwater mussels are critical to river ecosystems and to U.S. water supplies.

Weary of losing neighbors and patients to gunfire, St. Louis trauma surgeon Laurie Punch has a message: Gun violence is contagious, but so is healing. Doctors who teach can be part of the solution.

The initial results from an ambitious mission to get a spacecraft close to the Sun are shedding new light on some old mysteries about our closest star.

The Hollywood icon trades the red carpet for the Capitol steps.

Researchers have found that women who use permanent hair dye and chemical hair straighteners have a higher risk of developing breast cancer than women who don't use these products.

In the search for alternatives to coal and gas, some European countries have turned to a very old fuel. They're importing wood from the United States. Some environmentalists say it makes no sense.

Doctors used to worry that antiretroviral drugs were too powerful for HIV-positive newborns. More evidence is emerging that, in fact, early treatment can be safe and effective.

Amid a catastrophic fire season in Australia, what do we know about the fate of the koala?

Elephants, snakes and crocodiles? Researchers around the globe faced risky situations to gather wild relatives of key foods. That genetic pool could be vital to helping crops adapt to climate change.

Slabs of engineered quartz are cut to order in thousands of shops around the country that may not adequately protect workers from dangerous levels of the lung-damaging contaminant.

Researchers have found that by playing the sounds of healthy reefs in places where coral has died, fish are more readily attracted back, and help speed the reef's recovery.