For the fictional character Sherlock Holmes, deduction means to take in all available information, explore different possibilities and eliminate them one by one until we are left with the possibility that is most likely to be true. In this lesson Maria Konnikova, author of Mastermind: How to think like Sherlock Holmes, teaches you how to do just that. Learn how to observe the facts, reason precisely, and decide wisely through the art of deduction.Draw out the implications of your observations to their logical conclusionCounter the tendency to construct narratives by keeping track of the objective facts.Distinguish between the improbable and the impossible.