As for the impact on viewers, the effect of disturbing and violent images is hard to measure, said Elana Newman, who teaches psychology at the University of Tulsa and is a specialist in psychological trauma.

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According to Peggy Hill, a biologist from the University of Tulsa who organised the symposium, work on seismic signalling is blossoming.

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W. Coburn School of Law, at Oral Roberts University, in Tulsa, Oklahoma.

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