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Filed under: Brain Works, Educational, Human Perception, Legends, Myths, Perception, Psychology, Religion, Superstition Tagged: 13, 17, belief, beliefs, black cats, Christianity, coincidences, irrational, Jesus Christ, knock on wood, knocking on wood, logical, pagan, practices, psychological, psychological bias, religion, religious, spirit, spirits, Stuart Vyse, supernatural, superstition, Superstitions, TED, Ted-Ed, thirteen, tradition, Triskaidekaphobia, umbrella, vixi, whistling, youtube 
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