Spectators wearing 3D glasses watch a 3D presentation of French architect Jean-Pierre Houdin’s theory on the construction of the Great Pyramid, Friday, March 30, 2007 at the Geode cinema in Paris. During a 3D screening followed by a press conference at the Paris Geode cinema on Friday, Houdin exposed his revolutionary theory of the construction of the Great Pyramid of Khufu, arguing it was built from the inside. Houdin presented the hypothesis of an internal ramp and the use of a counterweight system. Houdin used 3D technology to have his theory confirmed. (AP Photo/Francois Mori)

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