Just wondering why some of the ‘protest’ signs were written in English…

Iran on Monday celebrated the one-year anniversary of the country’s first success in enriching uranium, as President Mahmoud Ahmadinejad prepared to announce new progress in the key process that the United Nations has demanded Iran halt.

Experts say the Natanz plant needs between 50,000 to 60,000 centrifuges to consistently produce fuel for a reactor or build a warhead.

In the enrichment process, uranium gas is pumped into a “cascade” of thousands of centrifuges, which spin the gas at supersonic speeds to purify it. Uranium enriched to a low level, at least 3 percent, can be used as fuel, while at a far higher level, more than 90 percent, it can be used to build a weapon.

Iran currently has two cascades of 164 centrifuges each operating at an aboveground portion of the Natanz facility in central Iran. The two cascades have produced small quantities of non-weapons grade enriched uranium, U.N. nuclear inspectors have said.