Prem Watsa, one of Canada's best-known value investors, has nearly doubled his stake in BlackBerry maker Research In Motion Ltd. to 9.9 percent, according to a regulatory filing Monday.

The increase makes him the largest shareholder in the struggling company and identifies a buyer for shares that other investors have been unloading.

Business software maker VMware is buying computer networking specialist Nicira for nearly $1.3 billion.

The deal announced Monday will expand VMware's product line in the rapidly growing field of computer "virtualization." The term refers to software that lowers the costs of running data centers by enabling a single computer to function like multiple machines.

On Tuesday, Apple is set to report financial results for the second quarter. Analysts are expecting net income of $9.8 billion. But whatever figure Apple reports won't reflect its true profit, because the company hides some of it with an unusual tax maneuver.

Apple Inc., already the world's most valuable company, understates its profits compared with other multinationals. It's building up an overlooked asset in the form of billions of dollars, tucked away for tax bills it may never pay.

Iranian athletes will compete against Israelis at the London Olympics, according to the country's chef de mission.

Iran has been criticized in the past because some of its athletes withdrew from events against Israelis at the 2004 Athens Games and 2008 Beijing Games.

A closely watched experimental Alzheimer's treatment has failed to slow the disease in one late-stage study, a big disappointment for doctors and patients but not the end of the road for the drug. Pfizer Inc. said Monday that it will continue to study its effect on a different group of patients.

Pfizer, which is testing bapineuzumab with partner Johnson & Johnson, said the injected drug didn't slow mental or functional decline in patients with mild or moderate Alzheimer's disease. The study included about 1,100 patients who carry a gene called ApoE4, which gives people a higher risk of developing the memory-robbing disorder.

When comedian Joan Rivers thought her New York apartment was haunted about 15 years ago, she called on New Orleans voodoo priestess Sallie Ann Glassman to perform a "spiritual cleansing" of the brownstone.

Glassman said the pair became friends during that meeting, at which Glassman wore a flowing white gown and chased off the disturbing spirits in a night of rituals.

Actress Cybill Shepherd is hoping the third time's the charm.

The 62-year-old's publicist confirms Shepherd is planning to marry a former jeweler-turned-psychologist named Andrei (AHN'-dray) Nikolajevic (nik-oh-LY'-eh-vish).

Mariah Carey will join "American Idol" as a judge next season, Fox announced Monday, bringing her star power to the show that remains a ratings leader but has seen its viewership and pop culture status diminish.

"I am so excited to be joining 'Idol,'" said Carey, addressing the Television Critics Association via Fox entertainment chief Kevin Reilly's cellphone, which he put on speakerphone for the hotel ballroom meeting.

Should all U.S. children get tested for high cholesterol? Doctors are still debating that question months after a government-appointed panel recommended widespread screening that would lead to prescribing medicine for some kids.

Fresh criticism was published online Monday in Pediatrics by researchers at one university who say the guidelines are too aggressive and were influenced by panel members' financial ties to drugmakers.

Somalia's most powerful militant group publicly executed three of its members Sunday, saying the trio had spied on the militants for the U.S. and British intelligence agencies.

Al-Shabab said the three men were CIA and MI6 informants, and were the reason several drone attacks killed leaders from the group.