Starting Wednesday, the sale of recreational marijuana begins in Canada following a law passed over the summer.

The law says anyone in Canada over the age of 18 is allowed to possess marijuana, provided it's less than 30 grams — just over an ounce. Canadians can also grow up to four marijuana plants in their home and buy from a provincially regulated retailer.

NPR CEO Jarl Mohn has named Nancy Barnes, a veteran newspaper editor, as the network's permanent chief news executive, NPR announced Tuesday. Barnes fills a nearly yearlong vacancy that was triggered by the firing of Michael Oreskes, NPR's former news head, over allegations of sexual harassment.

The price of beer could rise sharply this century, and it has nothing to do with trends in craft brewing. Instead, a new study says beer prices could double, on average, because of the price of malted barley, a key ingredient in the world's favorite alcoholic drink.

By projecting heat and drought trends over the coming decades, a team of researchers in China, the U.K. and the U.S. found that barley production could be sharply affected by the shifting climate. And that means some parts of the world would very likely be forced to pay much more for a beer.