Lady Gaga says she's "heartsick" to postpone four shows after sustaining an injury that's left her unable to walk.

A Tuesday news release says performances set for Feb. 13-14 in Chicago, Feb. 16 in Detroit and Feb. 17 in Hamilton, Ontario, Canada, have been postponed due to a case of synovitis, a severe joint inflammation.

Oprah Winfrey made a surprise appearance Tuesday night at the premiere of Beyonce's HBO documentary, 'Life is But a Dream,' posing with the star and speaking of the candor she showed in making it.

The film takes a no-holds-barred look at moments in the 31-year old singer's life, including her miscarriage, reports of faking her pregnancy, and firing her father as her manager.

When it comes to mating, guppies treasure their ugly friends — because they look so good by comparison.

An article published Wednesday by Britain's Royal Society says that male guppies prefer to associate with their drab-colored counterparts when females were around.

Bulgaria has given Europol the names of two of the people suspected in a bus bombing that killed five Israeli tourists last year, with hopes that the police agency can trace their movements and uncover how they financed the attack, the country's interior minister said.

The European country also has requested that Lebanese authorities arrest and extradite the two suspects, who are allegedly Hizbullah members and believed to be living in Lebanon, an official said.

Outwitting Alex Ferguson has never been so important for Real Madrid coach Jose Mourinho as he potentially puts his short- and long-term future on the line in the last-16 match against Manchester United in the Champions League.

With Madrid trailing Barcelona by 16 points in the Spanish league, the pressure is on Mourinho to deliver success in Europe and win the continent's most glittering prize for the club for the 10th time.

Want to know how much a hip replacement will cost? Many hospitals won't be able to tell you, at least not right away — if at all. And if you shop around and find centers that can quote a price, the amounts could vary astronomically, a study found.

Routine hip replacement surgery on a healthy patient without insurance may cost as little as $11,000 — or up to nearly $126,000.

Salt has quietly been slipping out of dozens of the most familiar foods in brand-name America, from Butterball turkeys to Uncle Ben's flavored rice dishes to Goya canned beans.

A Kraft American cheese single has 18 percent less salt than it did three years ago. The salt in a dollop of Ragu Old World Style pasta sauce is down by 20 percent. A handful of honey Teddy Grahams has 33 percent less salt. A squirt of Heinz ketchup is 15 percent less salty.

The brother of a Chicago man poisoned with cyanide shortly after winning the lottery said Monday he is the family member who asked authorities to reconsider the initial finding that his sibling had died of natural causes.

Imtiaz Kahn said he had nightmares about his brother before his death and that his suspicions about the death lead him to push coroner's officials to conduct more tests. Urooj Khan, 46, an immigrant from India, died July 20 as he was about to collect his $425,000 in Illinois State Lottery winnings.

IOC leaders dropped wrestling from the Olympic program on Tuesday, a surprise decision that removes one of the oldest Olympic sports from the 2020 Games.

The IOC executive board decided to retain modern pentathlon — the event considered most at risk — and remove wrestling instead from its list of 25 "core sports."

The Charlotte Bobcats ended Boston's seven-game winning streak as Byron Mullens scored 25 points and had 18 rebounds in a 94-91 win over the Celtics on Monday.

Kevin Garnett had 16 points and 13 rebounds for the Celtics, but missed a key 18-foot shot that would have given Boston the lead late in the game. Paul Pierce and Avery Bradley had chances to send the game into overtime in the final seconds, but missed open 3-pointers.