Causes, outcomes and the unknowing of the relationships between the two

An example of the importance of knowing the causal link between what you are looking for (the cause) and the outcome you are seeking to achieve (longer life).

Korea thryoid cancer screening & overdiagnosis. More you look, more you find. No impact on mortality. #podc2015 pic.twitter.com/DeUKuTPFuU

— Gary Schwitzer (@garyschwitzer) September 2, 2015