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Every day we鈥檙e bombarded with information and, with each new story or alternative fact, we have to decide what we believe to be true.

But some of the mental short cuts we take to sift through this material allow us to be deceived: past experiences, political beliefs and laziness can all cloud our judgment. In this episode of The Why Factor, Sandra Kanthal explores why truth can be elusive. We鈥檒l meet a woman who discovered her husband had been lying to her for 15 years, and fought through her pain to find the truth. We talk with one psychologist who argues that critical thinking skills can be weaponised to encourage a person to believe in conspiracy theories; and to someone who, through extensive research, is convinced the earth is flat. People shape their identities around their notion of truth. This may go some way to explain why it is easier to fool someone than to convince them they have been fooled.

Producer: Chris Browning

Picture: Goldfish Shark
Credit: Getty Images