One hundred years ago this month, a small house in Los Angeles was the scene of a series of religious meetings where participants had a new kind of spiritual experience. They had emotional displays, spoke in tongues, and experienced remarkable healing -- all manifestations, they believed, of the power of the Holy Spirit "filling" the participants.
Today, Pentecostals claim more than half a billion adherents around the world. It's one of the fastest-growing social movements ever, and one that has had a profound impact on even mainstream religions.
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