Alina Selyukh

Walmart says it will stop selling electronic cigarettes, at namesake stores and Sam's Club locations. The nation's largest retailer is responding to growing health concerns around vaping, especially among young people.

Walmart cited "growing federal, state and local regulatory complexity and uncertainty regarding e-cigarettes," saying that its stores will stop selling e-cigarettes once the current inventory is sold.

It's a case of animal versus vegetable — and the steaks are high.

A growing number of states have been passing laws saying that only foods made of animal flesh should be allowed to carry labels like "meat," "sausage," "jerky," "burger" or "hot dog."

"Big data" is a very 21st-century kind of buzzword, which ambiguously invokes the idea of using large sets of data to draw computer-assisted conclusions about trends, patterns and correlations, often about people and their behavior.

But if you wanted to trace the origin of using big data for health research, you'd have to go back — way back, to 17th-century England.

For the first time in history, federal researchers report that a majority of U.S. homes rely on cellphones alone for a telephone connection, without a landline.

The number of cellphone-only households predictably has been climbing over the years, surpassing the households with both a landline and a mobile phone and now reaching almost 51 percent. And it's tracked by — of all agencies — the Centers for Disease Control and Prevention.