منابع مشابه
Ancient maize from Chacoan great houses: where was it grown?
In this article, we compare chemical (87Sr/86Sr and elemental) analyses of archaeological maize from dated contexts within Pueblo Bonito, Chaco Canyon, New Mexico, to potential agricultural sites on the periphery of the San Juan Basin. The oldest maize analyzed from Pueblo Bonito probably was grown in an area located 80 km to the west at the base of the Chuska Mountains. The youngest maize came...
متن کاملMarket Integration, Development, and Smallholder Forest Clearance
A significant proportion of deforestation in Latin America is caused by smallholders living at the frontier of modern rural markets. This paper develops a household model that examines the roles of market integration, subsistence, time preference, and non-timber forest uses in the household’s decision to clear forest for future agriculture. The model explores the possible impacts of development...
متن کاملAncient DNA from Human and Animal
Research on ancient DNA (aDNA) has the potential to enable molecular biologists and archeologists to decipher certain aspects of history by direct looking into the past. However, several major problems in this field limit the applicability of aDNA studies, most importantly contamination with modern DNA and postmortem DNA degradation. In this study we extracted and analyzed aDNA obtained from ~3...
متن کاملSpare Time Activity Sheets from Photo Albums
Given arbitrary pictures, we explore the possibility of using new techniques from computer vision and artificial intelligence to create customized visual games on-the-fly. This includes coloring books, link-the-dot and spot-the-difference popular games. The feasibility of these systems is discussed and we describe prototype implementation that work well in practice in an automatic or semi-autom...
متن کاملThe Maya Forest: destroyed or cultivated by the ancient Maya?
B oth academic and popular perceptions concerning the relationship between the Maya (ancient and modern) and the Maya Forest in which their culture developed and persisted formore than three millennia are varied and continuously subject to change (1). The analysis of a sediment core from a pond located near the ancient Maya city of Copan, Honduras, interpreted byMcNeil et al. (2) in this issue ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Nature
سال: 2016
ISSN: 0028-0836,1476-4687
DOI: 10.1038/530419b