Because I was challenged on my assertion I will provide a citation. The following text describes the enrichment activities that were part of the Manhattan Project. As one can see, small is not an adequate descriptor."The K-25 Site occupies a 1,700-acre area adjacent to the Clinch River, approximately 13 miles west of Oak Ridge. The K-25 Plant was authorized in late 1942, and was the last of the big Oak Ridge sites to become operational. It was the world's first gaseous diffusion plant, the method of uranium enrichment with the best theoretical basis, championed by the British, but which had never been tried in practice.K-25 was huge, even by Oak Ridge standards, with fifty four-story buildings totaling 2,000,000 square feet, in a U-shape measuring a 2,600 feet long by 1,000 feet wide. Covering some 44 acres, the K-25 building was the world's largest roofed structure when it was completed in March 1945. Housing and service facilities were built for the population that eventually reached 15,000.Inside K-25, a series of over 1,000 huge cells were linked in a cascade through which uranium hexafluoride gas traveled, with small fractions of the U-235 isotope separated by a barrier material with microscopic pores. Production problems at K-25 led to an August 1943 decision that K-25 would not fully enrich uranium but would produce partially enriched feeder material for Y-12. A key production problem was developing a suitable diffusion barrier, material with millions of tiny holes that would also withstand the extremely corrosive gas involved. That problem was not solved until 1944 enabling production in 1945.Both the Y-12 and K-25 plants failed to meet expectations. Early in 1944 neither plant was producing anything usable, but Gen. Groves and his team pushed forward nonetheless. This was an enormous gamble with fantastic sums of money and scarce resources being poured into the Oak Ridge project. Gen. Groves decided to invest in a third technique, thermal diffusion, developed by Philip Abelson for the Navy. A contractor, H.K. Ferguson Company of Cleveland, was given just 90 days to construct the S-50 themal diffusion facility, involving 2,142 columns, each over 40 feet tall.As of April 1945, none of the processes worked well, but Oppenheimer devised a desperate solution. He ordered that Oak Ridge's three enrichment processes be run serially. The thermal diffusion process achieved less than two percent enrichment but this slightly enriched material greatly increased the efficiency of the gaseous diffusion process. When this product, enriched to about 23 percent U-235, was fed into the calutrons of the electromagnetic separation process, the result was 84 to 89 percent enrichment, good enough for weapons."http://www.olive-drab.com/od_nuclear_manhattan_oak ...I would encourage the war-mongers who want the U.S. to be the hammer that smashes Israel's enemies at least be honest about your aims and not hide between baseless scare stories that have been planted in the press.