About one in three people in the US will encounter some kind of medical mistake during a hospitalization. The number of mistakes has been seriously underestimated as new studies show that there are about 10 times more errors than previously believed. We cannot depend on health care practitioners to admit their errors unless there's no other option. A tool from the Institute for Healthcare Improvement documents that there are about 90 times more errors than are admitted by practitioners. This comes at a cost of about $17 billion per year!