The concept of over-diagnosis may be foreign to most patients, and even doctors too. Over-diagnosis refers to making a diagnosis that is ultimately not necessary, because the patient would never have suffered any symptoms or death from the said diagnosis.
Over-diagnosis usually occurs when you get screened for a disease, such as cancer, in an effort to detect it at an early stage when it may be more amenable to treatment and cure.
Anyone who has ever traveled by air will be familiar with all the safety measures mandated by the airline industry. What gets demonstrated by the crew as safety procedures while aboard is only the tip of the iceberg. There is much more that the ordinary passenger never gets to be aware of.
The modern aircraft has mind-boggling inbuilt safety processes, with monitoring of all conceivable eventualities and automation of remedial measures. Some have argued that the weakest link for airline safety is not the machine itself, but the human.