Crazy Celebritards That Take On Sceince.

Suzanne Somers

The perky blonde from Three's Company is now a bestselling author. Her 2007 book Ageless promotes "bioidentical" hormone replacement therapy as a fountain of youth for menopausal women. She told Oprah that she shoots a form of estrogen into her vagina every day. In fact, a big federal study has shown that hormone replacement therapy can boost the risk of heart disease and some types of cancer. (Proponents argue that the problem was the specific form of hormones that the feds used.) Her 2009 book, called Knockout, recounts her own battle with cancer using alternative remedies instead of chemotherapy and radiation, earning her more repudiation by mainstream doctors. Critics like the American Cancer Society say her views amount to quackery.

Jenny McCarthy & Jim Carrey

McCarthy, the former game show host and nude model, has an autistic son and is convinced that autism is caused by vaccines. She and romantic partner Carrey urge parents to skip child vaccinations, even though numerous scientific studies show no linkage between autism and shots. In 2008 the Centers for Disease Control reported that measles outbreaks are spiking, fueled by parents' decisions to leave their children unvaccinated.

Oprah Winfrey

Oprah has long been interested in health--helping to launch the television careers of psychologist Dr. Phil McGraw and surgeon Mehmet Oz. But too often her show is a forum for wacky science. Suzanne Somers and Jenny McCarthy have been on as guests to promote their outrageous claims. Winfrey called Somers a pioneer. In May Newsweek ran a cover story titled "Why Health Advice on Oprah Could Make You Sick." Besides dubious cures for menopause, cancer and autism, Winfrey has promoted the idea that thyroid disease is the result of stress and

hocked suspect weight-loss treatments and painless plastic surgery, according to Newsweek

Dan Aykroyd

The comedian and Blues Brothers star believes earth is regularly visited by UFOs. He also believes in ghosts (which may have improved his performance in Ghostbusters). It's unclear if these two beliefs are connected, but he makes his case for aliens in a documentary film called Dan Aykroyd Unplugged on UFOs. In it, he says, ominously: "We are dealing with beings who have anywhere from a thousand to a million to 10 million to a billion years advancement in technology on us." He doesn't appear to be kidding.

Arianna Huffington

The Huffington Post allows all sorts of counter-scientific theories to find a large audience. A damning article on Salon.com by pediatrician Rahul Parikh listed the various quackeries. Jim Carrey and Robert F. Kennedy Jr. have blogged there about the "dangers" of vaccinating children, and the site includes general endorsements of homeopathy and other New Age remedies as a matter of course. Detoxification and cleansing, including colonics, are a major theme of health coverage. Parikh concludes: "Huffington has distorted science and facts ... fairness and accuracy in health and medicine take a back seat to sensationalism and self-promotion."

Whoopi Goldberg

Whoopi's not so sure mankind ever visited the moon, as she mentioned last summer on her show The View. Her scientific evidence: The movie, the 1978 thriller Capricorn One about a Mars landing hoax.

Tom Cruise

Cruise has used his celebrity to attack the medical field of psychiatry, most infamously during a bizarre segment of the Today Show five years ago. During an interview with host Matt Lauer, Cruise criticized the actress Brooke Shields for having taken antidepressant drugs to combat postpartum depression. Cruise also excitedly condemned the use of the anti-hyperactivity drug

Ritalin.

Josh Beckett

Boston Red Sox pitcher and World Series MVP Josh Beckett also pitches magic necklaces from the Japanese company Phiten that supposedly improve health and performance. The company's Web site says its titanium-laced gear "works with your body's energy system, helping to regulate and balance the flow of energy throughout your body" by "stabilizing ions." Beckett is joined in credulity by dozens of sports stars, including New York Yankees pitcher Joba Chamberlin, tennis player Lleyton Hewitt, softball star Jennie Finch and marathoner Paula Radcliffe.

Ben Stein

Stein is the smart and funny actor and finance writer who doesn't believe in evolution, the central organizing principle of modern biology. His movie Expelled: No Intelligence Allowed attacks evolution and argues that the concept of Intelligent Design should be taught in science classrooms. Intelligent design is not science but religion, a Republican federal judge in Pennsylvania decided in a 2005 case challenging the teaching of intelligent design in science class.

Pamela Anderson

Medicine has obviously done some wonderful things for Pamela Anderson, but she hasn't returned the favor. At least in her role as activist for People for the Ethical Treatment of Animals, which opposes using animals to test experimental drugs. PETA's take is that an animal has as much right to life as a person. Never mind if this results in fewer breakthrough cancer drugs. For her part, Anderson doesn't seem to delve into details on the subject. When CNN's Larry King asked her whether she opposes vivisection, she got confused and said "I thought you meant vasectomy."

Kirk Cameron

The actor most famous for his role in television's Growing Pains in the late 1980's now has it out for evolution. His big evidence against the science: That there's no such thing as a "croco-duck," which he says is needed to explain evolution. He and cohort Ray Comfort also argue that existence of the banana, with its convenient tab for opening and biodegradable packaging, is proof positive evolution is bunk.