The findings in the journal Science have implications for questions regarding how animals and plants grow minerals into shapes that have no relation to their original crystal symmetry, and why some contaminants are difficult to remove from stream sediments.
The world's deserts may be storing some of the climate-changing carbon dioxide emitted by human activities, a new study suggests. Massive aquifers underneath deserts could hold more carbon than all the plants on land, according to the new research.
A study by multi-institutional, international collaboration of researchers, published this week in Science presents strong evidence, gleaned from ancient and modern DNA samples, that the ancestry of all Native Americans can be traced back to a single migration event, with subsequent gene flow between some groups and populations that are currently located in East Asia and Australia.
The Viking hit-and-run raids on monastic communities such as Lindisfarne and Iona were the most infamous result of burgeoning Scandinavian maritime prowess in the closing years of the 8th century. These skirmishes led to more expansive military campaigns, settlement, and ultimately conquest of large swathes of the British Isles. But Dr. Steve Ashby, of the Department of Archaeology at the University of York, wanted to explore the social justifications for this spike in aggressive activity.
New research reveals that some of the earliest civilizations in the Middle East and the Fertile Crescent may have been affected by abrupt climate change. These findings show that while socio-economic factors were traditionally considered to shape ancient human societies in this region, the influence of abrupt climate change should not be underestimated.
Measurements of iron speciation in ancient rocks were used to construct the chemistry of ancient oceans. Analysis suggests that it took less oxygen than previously thought to trigger the appearance of complicated life forms.
Rapid phases of warming climate played a greater role in the extinction of megafauna in the Late Pleistocene than did human activity, a new study shows.
New research has revealed abrupt warming, that closely resembles the rapid man-made warming occurring today, has repeatedly played a key role in mass extinction events of large animals, the megafauna, in Earth's past.
Until now, researchers believed farming was 'invented' some 12,000 years ago in an area that was home to some of the earliest known human civilizations. A new discovery by an international collaboration of researchers from Tel Aviv University, Harvard University, and others offers the first evidence that trial plant cultivation began far earlier -- some 23,000 years ago.
An international team of researchers compared the genomes of 31 living Native Americans, Siberians and people from Oceania with 23 ancient Native American genomes to establish a timeline for the arrival and spread of Amerindian populations. They concluded that the first Americans arrived after about 23,000 years ago and diverged around 13,000 years ago into two populations. They found no admixture of Polynesian or European genes, but did find some East Asian gene flow.