From the Wires

U.S. economy grew by 4% in Q2

Bloomberg: Real gross domestic product in the United States increased at an annual rate of 4% in the second quarter of 2014.

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.