Security Council, Iran will stop its voluntary measures, such as snap inspections, increased inspections of its nuclear sites, and also it will restart a uranium enrichment at a high industrial scale.

NPR: Reaction in Iran to Possible U.N. Sanctions

Iran told the agency that no nuclear material had been introduced into the plant, and enrichment levels would only be high enough to make nuclear fuel, not a bomb.

BBC: Iran 'concealed nuclear facility'

Without going into entirely boring detail, the Iranian plan for uranium enrichment depended on a series of high speed centrifuges.

FORBES: Stuxnet Was a Joint US/ Israeli Project

Amano noted that Iran has recently begun installing IR-2m centrifuges at its fuel enrichment plant at Natanz, and that those high-speed devices that rotate to enrich uranium are more advanced than the previously-installed centrifuges.

CNN: Nuclear watchdog agency says Iran not cooperating

The Center offers young people diverse, educational and extracurricular enrichment activities as well as support to help prepare them to graduate from high school and to pursue college and meaningful careers.

WHITEHOUSE: The White House

They include Iran's ongoing uranium enrichment program, experiments with small amounts of plutonium, and a possible program that combines work on high explosives, missiles, and uranium.

NPR: Iran Defies Security Council, Enriches Uranium