Mastering the techniques involved in enriching uranium (so far Iran claims to have done only experimental work) is one of the biggest hurdles to bomb-building.
Mr. Mayne is a gifted, experimental, unconventional architect who designs attention-getting structures such as the San Francisco Federal Building and the Caltrans headquarters in Los Angeles.
Such composites of steel and concrete have been used in the world's tallest building--the Petronas Towers in Kuala Lumpur, Malaysia--and its most experimental, Frank Gehry's Jimi Hendrix Museum in Seattle.