This week in Los Angeles some 60-thousand charismatic Christians are gathering to celebrate the centennial of the 1906 Azusa Street revival, which launched the modern Pentecostal movement. Pentecostals believe in a personal commitment to Jesus Christ. They also believe in what they call the baptism of the Holy Spirit, which is usually evidenced by speaking in tongues, though experts estimate that only 40 percent of Pentecostals speak in tongues today. Those attending the centennial celebration include a who's who of Pentecostal preachers. Larry Mantle will speaks with religious scholars about the Pentecostal movement, its history and impact on American culture and the rest of world.