"You see it in Israel and Palestine, Georgia and Russia, Pakistan and India, " said Eugene Spafford, a computer security specialist at Purdue University who has advised two U.S. presidents and numerous companies and government agencies.

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In high school he excelled in science and mathematics and won a U.S. Navy scholarship to Purdue University in Indiana, enrolling in 1947.

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At Purdue University, 17% of undergraduates are from outside the U.S., mostly from China, up from 9% in 2009.

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The Purdue team, assisted by the Indiana Department of Natural Resources and the U.S. Geological Survey, collected water samples containing Asian carp eggs in 2011 from sections of the river that were much shallower and narrower than had been considered necessary for spawning, Goforth said.

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