It is estimated that between one-half to two-thirds of the value of all U.S. currency in circulation is outside of the U.S. In 1934, the $100,000 Gold Certificate became the highest denomination ever issued. It was never intended for public use. Instead, it was meant solely for official transactions between Federal Reserve Banks.
Enriched uranium. Enriched uranium is a type of uranium in which the percent composition of uranium-235 has been increased through the process of isotope separation. Natural uranium is 99.284% 238U isotope, with 235U only constituting about 0.711% of its weight. 235U is the only nuclide existing in nature that is fissile with thermal neutrons.
enrichment is the process of creating nuclear fuel from uranium needed for peaceful reactors and nuclear weapons. Up to Speed: Nuclear Deal With Iran Reached Eli Lake November 23, 2013. As a result of the French posturing, that enrichment probably will continue, at least for the moment. Why France Is to Blame for Blocking the Iran Nuclear Agreement Christopher Dickey November 9, 2013.