In the days before carbon monoxide detectors, coal miners carried caged birds underground to warn of gas leaks. The animal's death indicated danger. Today, men have another tool for identifying the onset of equally deadly atherosclerosis. Dr. Diehl... Read More

In the days before carbon monoxide detectors, coal miners carried caged birds underground to warn of gas leaks. The animal's death indicated danger. Today, men have another tool for identifying the onset of equally deadly atherosclerosis. Dr. Diehl explains. Read Less