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NOVA - Riddles of the Sphinx

Riddles of the Sphinx Riddles of the Sphinx
A marvel of ancient engineering is vanishing. Can it be saved?
http://video.pbs.org/widget/partnerplayer/1390312942/?player=WGBY-PBS&w=512&h=288&chapterbar=true&autoplay=false A marvel of ancient engineering is vanishing. Can it be saved? /episodes/get/2393 /episode/2393 NOVA: Riddles of the Sphinx /episode-player/2393
2393