NEW YORK ( TheStreet) -- Popular searches on the Internet include Warren Buffett, after the 81-year old billionaire investor announced he has been diagnosed with stage-one prostate cancer. In a letter to shareholders, the chairman and CEO of Berkshire Hathaway ( BRK-A) indicated he will begin a two-month radiation treatment in mid-July. He said the treatment will restrict his ability to travel, but otherwise should not affect his ability to work. Buffett tried to alleviate concerns by assuring that his prognosis is "not remotely life-threatening." Buffett said he was diagnosed on April 11. He has undergone several tests, none of which indicate cancer in any other part of his body. Stage one is the earliest and least deadly stage of prostate cancer. Statoil ASA ( STO) is trending as its board of directors has decided to accept a cash offer of $2.8 billion from Alimentation Couche-Tard to buy the company. Couche-Tard will offer Statoil Fuel & Retail shareholders 53 Norwegian kroner, or $9.22, per share. Couche-Tard plans to fund the deal through credit facilities and a $3.2 billion financing arrangement over three years. The deal is in line with Couche-Tard's growth strategy to expand into Scandinavian and Eastern European regions. Statoil said the sale would help the company focus on its oil and gas exploration and production business. The acquisition still needs approval by regulators and is expected to go through by the end of June. Halo 4 is a popular topic on the Web, after Microsoft ( MSFT) excited fans of the franchise by announcing the release date of its next installment. Microsoft announced Halo 4 is slated for worldwide release on Nov. 6. It will be the seventh game in the franchise, and will feature the return of Master Chief Petty Officer John-117, who has not been in the series since the end of 2007's Halo 3. Master Chief is expected to face new challenges and obstacles unlike those he has faced in the game before. He will also have cosmetic changes, including wearing a more prominent bodysuit with different type of armor.