Killer waves: Scientists study how tsunamis changed history[ Fri, 29 Mar 2013 23:41:49 GMT ]By Becky OskinLiveScienceIn a jumbled layer of pebbles and shells called the "Dog's Breakfast deposit" lies evidence of a massive tsunami, one of two that transformed New Zealand's Maori people in the 15th century.After the killer wave destroyed food resources and coastal settlements, sweeping societal changes emerged, including the building of fortified hill forts and a shift toward a warrior cul...