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David Ricardo ( 1772-1823 ) , brilliant British classical economist and a bullionist along the line of Henry Thornton ( 1760-1815 ) , wrote : " On extraordinary occasions , a general panic may seize the country , when everyone becomes desirous of possessing himself of the precious metals as the most convenient mode of realizing or concealing his property , against such panic , banks have no security on any system . " In normal times , four million people come every year to the capital . " pipeline " since military aid was frozen in 1990 . The submillimeter region of the electromagnetic spectrum has been called " the final frontier " of ground-based astronomy . Small amounts of water are locked up in certain minerals that require H2O in their formulae ; this may in toto be a large amount but being bound in the crystalline structure this water is " unavailable " for direct use by life .