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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.

Amid this week's hoopla celebrating the Hubble Space Telescope, don't forget the clever astronomer for whom the space scope was named. In the 1920s, he changed our sense of ourselves and the universe.

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.

Medicaid expansion was a big deal in a handful of state legislatures this year. Wyoming said no. Tennessee said no. But Montana said yes, and three more states are coming down to the wire.

A mysterious set of medical complications plagues some survivors: joint pain, vision loss, rashes. Doctors aren't sure why it's all happening. But they have a name for it: post-Ebola syndrome.

Nine media organizations, including The New York Times and National Geographic, have signed a deal to distribute their content through a new Facebook feature called "Instant Articles."

Network officials are gathered in New York this week to present their new fall lineups to advertisers. Renee Montagne talks to Kim Masters, of The Hollywood Reporter and host of KCRW's The Business.

NPR's Tom Goldman joins Scott Simon to talk about the Women's World Cup. He'll also talk hockey playoffs, previewing the Chicago Blackhawks - Anaheim Ducks matchup.

In her new book, social researcher Wednesday Martin examines the sometimes puzzling culture of motherhood in that most exotic of locales — Manhattan's Upper East Side.

Three years ago, the court struck down mandatory life sentences in cases involving juvenile defendants. Should that ruling be applied retroactively to those sentenced to life long ago?