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Source: http://www.nytimes.com/2010/03/09/science/09enrich.html
For Iran, Enriching Uranium Only Gets Easier
(New York Times) William J. Broad - Uranium enrichment is a tricky process that accelerates as it moves ahead. "The higher the concentration, the easier it gets," said Houston G. Wood III, a professor of mechanical and aerospace engineering at the University of Virginia who specializes in nuclear enrichment. On Feb. 7, Iran announced it would begin enriching its stockpiled uranium to 20% from 4%, which nuclear experts said was actually a fairly easy step - not at all as demanding and time-consuming as raising the level to 4% from 0.7%.