Say it with me: “I am not afraid of Friday the 13th.” Did you say it? If you did, you get a gold star. Well done! If you were able to say that out loud and actually believed the words you said, you have conquered Friggatriskaidekaphobia, or the fear of Friday the 13th. Seventeen to 20 million people in the United States are afflicted by this fear, according to a study that was conducted by the Stress Management Center and Phobia Institute in Asheville, North Carolina. The number 13 has been thought to be an eerie number for centuries:  as a numeral, the number 12 has been typically thought of…