Skulls and other human bones poke from large ceramic jars at Khnorng Sroal, one of the newly dated mountainside burials in southwestern Cambodia's Cardamom Mountains. The bones were placed in the 20-inch-tall (50-centimeter-tall) body jars only after the bodies had decomposed or had been picked clean by scavenging animals, according to the study, which is published in the latest issue of the journal Radiocarbon. "The Cardamom highlanders may have used some form of exposure of the body to de-flesh the bones, like the 'sky burials' known in other cultures," study leader Beavan said. Placing the sky-high burials couldn't have been...