From the Wires

Twitter Q2 revenue surges

USA Today: The social network's second-quarter revenue rose 124% to $312 million.

Pfizer results beat estimates

WSJ: The pharmaceutical giant posted earnings of $2.91 billion, or 45 cents per share.

Study: Running reduces risk of death

TIME: A new study published in the Journal of the American College of Cardiology shows that running—even slowly—greatly reduces the risk of a cardiovascular-related death.

Zillow to acquire Trulia for $3.5B

NYT: The online real estate listing website will purchase its competition, Trulia, for about $3.5 billion in stock.

Dollar Tree to buy Family Dollar

WSJ: Dollar Tree will acquire the struggling discount retailer in a cash-and-stock deal valued at about $8.5 billion.

Facebook revenue surges 61%

Bloomberg: The socia network reported sales rose to $2.91 billion from $1.81 billion the year before.

Walmart unexpectedly fires CEO

Forbes: The retail giant fired Bill Simon and named Greg Foran as its new President and CEO.

GM profit declines 80%

WSJ: General Motors reported an 80% drop in its Q2 net profit, with earnings hit by $1.5 billion in recall-related charges.

Study: Dogs can feel jealousy

Reuters: A study found that dogs are capable of feeling a basic form of jealousy.

Boeing profit surges 52%

Forbes: The aerospace and defense company reported $22.04 billion in second quarter revenue.

Apple: iPhone sales jump

WSJ: The consumer electronics giant reported its smartphone sales jumped 12.7%, but its iPad sales fell 9.2% after a 16% decline three months earlier.

Comcast profit rises 15%

WSJ: The cable-TV provider reported Q2 profit of $1.99 billion, up from $1.73 billion last year.

American fast food chains snagged by food safety scandal in China

Forbes: Workers at a meat supplier in China were shown reusing meat that had fallen to the factory floor, as well as mixing fresh and expired meat. The company then distributed the meat to KFC and McDonald's restaurants in the Shanghai area.