What lack of understanding? We know how those things were built or have a very good idea. Although most of the techniques are clever, they're not particularly

What lack of understanding? We know how those things were built or have a very good idea. Although most of the techniques are clever, they're not particularly advanced. For example, http://news.nationalgeographic.com/news/2012/06/120622-easter-island-statues-moved-hunt-lipo-science-rocked/ http://news.nationalgeographic.com/news/2012/06/120622-easte...