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In this Monday, Dec. 2, 2013 photo, a guide stands at the entrance of a cave which scientists said reveals history of ancient tsunamis in Lhong, Aceh province, Indonesia. The cave discovered near the source of 2004’s massive earthquake-spawned tsunami in Indonesia contains the footprints of past gigantic waves dating up to 7,500 years ago, a rare natural record suggesting future generations living in the coastal area must stay prepared because disasters can occur in relatively short bursts or after long lulls. (AP Photo/Heri Juanda)

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