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Women with dense breasts are more likely to get cancer and less likely to catch it early on a mammogram. But degree of density matters too, a study finds, as do other factors like family history.

GOP presidential hopefuls converged in Iowa for the Lincoln Day Dinner. More candidates are entering the presidential race, in part, because there is no obvious next-in-line for the GOP nomination.

What if microbes could ferment sugar into narcotics, like the way yeasts make beer? That day is quickly approaching. This week scientists report all the steps needed to make morphine in yeast.

Newly declassified materials include books, magazines and letters found during the 2011 raid on the al-Qaida leader's compound in Abbottabad, Pakistan.

In a historic civil settlement, VW will buy back or repair cars sold as "clean" but that in fact polluted above legal levels. The company will also pay nearly $5 billion for environmental reparations.

This week Donald Trump and Hillary Clinton gave major speeches on the economy, but most of the attention was on their gaffes and controversies.

One athlete's "psych-up" ritual may psych out an opponent. And even treatments that lack hard evidence of benefit, scientists say, might provide a competitive edge if the athletes believe they work.

Magic Mountain in Southern California has a roller coaster in which riders put on VR goggles to see an imagined world while their bodies undergo the physical thrills. How is it? We get a review.

Politics has always been a rough game. But even by the old standards, Donald Trump's campaign is breaking new ground. Crude language is the norm, including from the candidate himself.

The Supreme Court upheld affirmative action in college admissions Thursday in a 4-3 ruling on the University of Texas' use of race as a factor in a program to increase diversity in the student body.