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Modern MarvelsEntries and exits; world's tallest doors at the Vehicle Assembly Building at Kennedy Space Center; a company that makes blast doors and bulletproof doors; fabricating doors for homes.

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Now PlayingModern MarvelsEntries and exits; world's tallest doors at the Vehicle Assembly Building at Kennedy Space Center; a company that makes blast doors and bulletproof doors; fabricating doors for homes.0Modern MarvelsBrief history of undergarments; the evolution from itchy woolen union suits to comfortable briefs and boxers; socks with special threads to prevent odor; fire retardant underwear; the bra industry.