It seems as though Iran really enjoys stirring up trouble with the west:
For those who are not familiar, 20% enriched uranium is called Highly Enriched Uranium, and is a higher grade that what you find just lying around, or than what is commonly used for experiments at universities and so forth. It is still well short of the 90% enriched uranium necessary for weapons, but getting to 20% is the hard part. Once a country can create HEU, it is a relatively small step to weapons grade. For a reference on uranium enrichment, check out the Federation of American Scientists page on enrichment.
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