In 1993, Professor John Anthony Allan of King’s College London coined the term "Virtual water" because the term 'embedded water' "did not capture the attention of the water managing community" and he wanted to create a metaphor to talk about why the long-predicted water wars have still not happened.

Arctic sea ice coverage declined to its annual minimum on September 17th and the National Snow and Ice Data Center (NSIDC) at the University of Colorado, Boulder find that this year's minimum extent is similar to last year's and below the 1981-2010 average of 2.40 million square miles. 

Over the 2014 summer, Arctic sea ice melted back from its maximum extent reached in March to a coverage area of 1.94 million square miles, according to analysis from NASA and NSIDC scientists. 

If you had an angel walking beyond you, would you be more reckless or more cautious?

It's surprising how many people believe that guardian angels watch over them to keep them safe in a dangerous world, and it's even more surprising that those who believe are actually less inclined to take risks despite this protection. 

Scholars David Etkin, Jelena Ivanova, Susan MacGregor and Alalia Spektor surveyed 198 individuals and found that of those who believe in guardian angels, 68% said that this belief affects how they take risks. 

What causes segregation? No one knows. No one even knows where the line is. For example, in science classes, there is worry that if there are not enough people 'like' an individual, they will feel intimidated and excluded. But when there are lots of people like an individual, they tend to self-segregate into groups based on gender and ethnicity.

On the city-wide level, environmentalists advocate very dense housing because it has lower strain on the land, but a new study in PNAS finds that dense cities lead to more segregation, even in previously integrated neighborhoods. Racially and economically mixed cities are more likely to stay integrated if the density of households stays low.

Nature Publishing Group has announced that Nature Communications will only accept open access research submissions starting October 20th 2014.

This is a big win for open access.  The 2013 Impact Factor for Nature Communications is 10.742, according to the 2013 Journal Citation Reports® Science Edition (Thomson Reuters, 2014). When it launched in 2010 it was a hybrid journal, publishing both open access and subscription content, but they now get over 1500 submissions every month so open access is viable.

Khabarovsk Krai, a territory occupying the coastline of the Sea of Okhotsk, is on fire. Dozens of red hotspots, accompanied by plumes of smoke mark active fires. The smoke, which appears mostly white or grey, blows to the east towards the Sea of Okhotsk.

Taiga and tundra are found in the north of this area, swampy forest inhabit the central depression, and deciduous forests are the natural vegetation in the south.