complex structures like the pyramids.]]> effects of embalming chemicals in prehistoric times.]]> occur on fabrics, the scientists concluded that the Egyptians mixed these materials together to create a type of embalming agent.]]> pyramids.]]> structures like the pyramids.]]> microscopes.]]> climate of ancient Egypt was full of dry sand and wind.]]> preservation wasn't always an accident in 4300 B.C..]]> petroleum.]]> cemeteries.]]> sophisticated.]]> accident in 4300 B.C..]]> expert from Sydney, Australia, and Stephen Buckley, a chemical archaeologist from the University of York in England.]]> elaborate ceremonies.]]> theories for mysteries they could not explain.]]>