*What doctors are reading this week and why it matters*

Dr. Cindy Haines reviews the literature on spanking children, burning incense, Indian medicine, diverticulosis and treadmill exercise for stroke victims.

It's back to school time. For many, this is an exciting time of selecting new lunchboxes, school supplies and that all-important first-day outfit. For others, it is a time of extreme anxiety and fear, knowing that the abuse is about to begin -- again.

*What doctors are reading this week and why it matters*

Dr. Cindy Haines reviews the literature on breast cancer, hormone therapy, air pollution, grapefruit and aging.

What if animals came with bar codes? Biologist George Johnson say they come with something just as good, meaning that telling tilapia from tuna may soon be within the power of everyman. (Photo from Sxc.hu)

Christina Applegate, the Emmy Award winning actress who starred in Married ... with Children, was recently diagnosed with early stage breast cancer. She has since undergone a double mastectomy and is now reportedly cancer-free. She tested positive for one of the "breast cancer genes" and underwent an MRI, which is a test not commonly performed on women because of the cost and liklihood of detecting false abnormalities. Dr. Haines looks into her story.

*What doctors are reading this week and why it matters*

Dr. Cindy Haines reviews the literature on IBS, diabetes and weight loss, vitamin D and air pollution.

Up to three centuries ago, at the time of Galileo, there was no clock worthy of the name. The most technically sophisticated instruments used to measure time were sundials.

Sundials date back to about 1500 BC. And today, most are out of sight and out of mind.

Performance-enhancing drugs such as anabolic steriods must be banned: Athletes who use them are cheating and harming the body in several ways. Biologist George Johnson explains how they work and why athletes think they can beat the testing regimes. 

For Iraq War veteran Brad Seitz, the color purple symbolizes five years of life after near-death.

Purple balloons will direct guests to a party this weekend noting the fifth anniversary of the day he earned a Purple Heart in service to his country. He will hang out with family and friends in the recreation center of the Jefferson Barracks VA Medical Center. Setz, 31, has a fondness for the place. On Thursdays, it's open to veterans of the wars in Iraq and Afghanistan. It's a place to find people who understand him.

Here, too, Seitz has found help to cope with post-traumatic stress disorder.

The Olympics are in full swing. Our athletes are bringing home the gold. Still, all is not well in Beijing. Concerns have been swirling around Beijing's air quality for months. China's weather exacerbates the effects of the pollution. And if Mother Nature has any consistency at all, it's in being inconsistent. It will be largely a matter of luck whether the best - or worst - air quality corresponds with the outdoor Olympic events.