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The site was identified by St. Justin Martyr in the second century as a manger in " a cave close to the village . Be sure the humidifier is clean and free of mold . Their movements are timed so that each body in turn passes between the other two . If all four people move at the same time and at the same constant speed , each person follows a spiral path toward the square 's center . In the United States , where there is no external threat to Copts , he said the danger is that people will wander from the church because of the temptations of secular life . " Christianity : Bethlehem was the site of the nativity of Jesus Christ , according to the New Testament . Joseph Gerver of Rutgers University , for instance , found one set in which four bodies stay at the corners of a parallelogram at every instant , while each body follows a curve that looks like a figure-eight with an extra twist .