Why a new study suggests you wear a face mask when you speak to anyone.

Gas prices in Texas and elsewhere in the United States have jumped an average 7 cents in recent days after Iran threatened to close the Strait of Hormuz through which 16 million barrels of oil - about a fifth of world's daily oil trade - passes every day.

25-year-old Ethiopian Kenenisa Bekele remains unbeaten in all his eight 10,000m races including the 2004 Athens Olympics.