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Companies including PayPal and Apple are competing to convince merchants and consumers to use their swipe-and-go mobile payment systems. Credit card breaches may speed up the use of digital wallets.

Democrats see an opportunity in the South's changing demographics — particularly in states with growing Hispanic communities, lots of unregistered black voters and migration from other states.

Sympathy for former Rep. Gabrielle Giffords, who was shot in the head in 2011, helped get her successor elected. Now she lobbies for tighter gun laws, and a tough ad from her PAC has stirred anger.

The midterm elections are less than a month away, and across the country, governors are in trouble. In both parties, state chief executives are facing tough re-election fights.

True confession: Our editors mistook a sheep for a goat. Now we've learned a lot about how cool sheep really are. Maybe our blog should be ... "Sheep and Soda?"

In 2014, Uber became one of the most valuable privately held companies on Earth. It expanded to more than 200 cities, but criticism and legal battles have ballooned in parallel with its revenues.

Carmen Martinez Ayuso was evicted from her apartment because her son took out a loan he couldn't repay. Now she's been the recipient of unexpected kindness this holiday season.

When science cannot explain patients' recoveries, even a doctor who studiously makes decisions based on the medical evidence is forced to rethink his ideas about hope and miracles.

Scientists are growing mock organs made of human cells to better study diseases and help test drugs. Researchers at Johns Hopkins are working on a gut-on-a-chip.

Inmates in the U.S. have a high rate of infection with chronic hepatitis C — up to 35 percent or more by some estimates. New drugs introduced this year can cure the disease quickly, but at a cost.