Roland Fletcher, an Australian archaeology professor, points to an Angkorian hydraulic reservoir in Siem Reap province, Cambodia, Jan. 23, 2008. An international research group is now trying to dig up answers to the question about Angkorian hydraulic network as part of its quest to shed more light on the puzzles left since the demise of the Angkor city centuries ago.(AP Photo/Heng Sinith)
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