Despite today’s advanced technology, medical errors due to doctors’ negligence or technical skills are still frequent and even on the rise. In response, all U.S. hospitals hold regular seminars to draw lessons and improve medical care. According to a 1999 report by the Institute of Medicine, 98,000 American patients die each year due to medical errors. And today, the death rate due to medical errors in the United States has even increased to 200,000 cases per year. Why is it so difficult to avoid such accidents? One of the major reasons is “defensive medicine”. Doctors now prescribe medication to patients, mostly to avoid liability. Some surgeons, in addition to not prescribing drugs indiscriminately, will generally allow patients to undergo tests that may not be necessary. In a recent anonymous U.S. survey, an orthopedic surgeon revealed that 24% of the tests doctors perform on patients are unnecessary. In fact, the more tests there are, the higher the chance that doctors will make mistakes, such as false positives on CTs and MRIs, leading to overdoses and allergic reactions in patients. In 1900, Dr. Ernest Codman, a physician at the Massachusetts Institute of Medicine in Boston, was given the authority to monitor doctors and even chief physicians for errors. In 1900, Dr. Ernest Codman initiated the “Morbidity and Mortality” symposium at Massachusetts General Hospital in Boston, where peer-to-peer discussions were held on medical errors, complications, deaths, and rare cases. Most health care providers in the United States (e.g., medical centers, large private hospitals, and surgical hospitals) hold these meetings on a regular basis (e.g., on a weekly, biweekly, or monthly basis). The meetings are non-punitive, legally protected and confidential, and are designed to improve patient care, review cases and improve the quality of care. Each physician can learn from these cases, gain experience, and avoid such medical errors as a lesson learned. In addition, the conference participants can suggest improvements to outdated medical policies, patient identification procedures, and avoidance of calculation errors, among others. In addition, in order for everyone to learn something valuable through academic exchange, academic competence, and avoid unnecessary errors, almost all hospital departments and research institutes in the United States hold weekly academic seminars (usually in the form of presentations) with speakers who are primarily physicians in the department or experts in the relevant field brought in from various hospitals and institutes, and participants are available to ask questions or provide suggestions. This shows that the efforts made by hospitals to improve the treatment of patients and avoid the frequent occurrence of medical errors cannot be ignored.