A Novo Nordisk stock tumble

From the BBC World Service: Shares in the Danish pharmaceutical giant Novo Nordisk tumbled 17% on Wednesday after the weight-loss drug pioneer warned of a decline in sales this year amid increasing competition and pressure on prices. Then, the United States renewed an agreement that gives 32 African countries duty-free access to the U.S. market. And later, the prime minister of Spain says he intends to ban social media for children under 16.