The nations' medical bill last year exceeded $2.7 trillin -- nearly as much as the projected total cost of the Iraq war. If it were medical money well spend, there might be few cries to "reform" the American health care system. But by some estimates, one-third or more of the medical care received by patients in this country may be virtually worthless. The nation is wasting hundreds of billions of dollars each year on superfluous treatments -- money that otherwise could by spent, for example , on providing health insurance for every child, woman and man int his country who currently have no coverage. A team of science and business reporters from The New York Times set out to explain how and why the United States is spending so much on health care with so relatively little to show for the money, They discovered a gaping chasm between scientific evidence and the practice of medicine. In an in-depth series of articles, told through real doctors and patients, and based on information they dug up that was frequently unflattering to medical providers, companies and regulators, the Times team documented many disturbing instances of "The Evidence Gap."