the closer you start to get to total agreement,the less reliable the result becomes.

So it's natural to think that more consensus is a good thing.And up until a certain point, it usually is.But sometimes, the closer you start to get to total agreement,the less reliable the result becomes.This is called the paradox of unanimity.The key to understanding this apparent paradox is in considering the overall level of uncertainty involved in the type of situation you're dealing with.If we asked witnesses to identify the apple in this lineup, for example,we shouldn't be surprised by a unanimous verdict.But in cases where we have reason to expect some natural variance,