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Belief can be a powerful force.

No one knows that better than the people who are sure they've seen Bigfoot in Colorado.

"It was not a human gait. It was not a human," says Kate Murphy of her May 2012 Bigfoot sighting in the woods.

Murphy says she feels "blessed" she had the encounter. "I mean, it turned my life upside down. I'm not just looking at the trees now, I'm kind of looking behind the trees"