From the Wires

BBC: A new study reports that rising levels of carbon dioxide worldwide will significantly affect the nutrient content of crops.

CNN: The Wall Street Journal Twitter account was hacked by the Syrian Electronic Army.

BBC: New figures show that maternal deaths worldwide have dropped by 45% since 1990.

Forbes: News that the retailer will close 400 stores by 2016 sent Office Depot shares soaring.

BBC: The World Health Organization declared the spread of polio as an international public health emergency.

TIME: The company will no longer use brominated vegetable oil, which has been linked to a flame retardant, in its Powerade sports drink.

CBS: Older mice who were given blood and blood proteins from young mice showed improved muscle and brain function.

WSJ: The unemployment rate in America dropped to 6.3%, the lowest since September 2008.

CNN: Five conditions cause nearly 900,000 deaths per year in America: heart disease, cancer, lung disease, stroke and unintentional injuries, like car accidents or medication overdoses.

CNN: Senate Republicans blocked a measure that would raise the federal minimum wage to $10.10 an hour.