In the early morning hours of March 4th, 2002, a reconnaissance team of US Navy SEALs became pinned down on the ridge dividing the Upper and Lower Shahikot valley in Afghanistan.
A Chinook helicopter with 21 men on a mission to rescue them was heading for the snowcapped peak of Takur Ghar when U.S. military officers in Bagram radioed them with a message not to land on the peak, because the mountaintop was under enemy control.
The rescue team never got the message. Just after daybreak, the Chinook took heavy enemy fire and it crash-landed on the peak. Three men were killed in the ensuing firefight.
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.
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.
Electrical engineering researchers have developed a unique nanoscale device that demonstrates mechanical transportation of light.
The nanoscale device that can capture, measure and transport fundamental particles of light - photons. The tiny device is just 0.7 micrometers by 50 micrometer (about .00007 by .005 centimeters) and works almost like a seesaw. On each side of the "seesaw benches," researchers etched an array of holes, called photonic crystal cavities. These cavities capture photons that streamed from a nearby source.
Gravitational waves are phenomena predicted by Einstein's theory of General Relativity but no one has ever observed them and their discovery would have profound implications for the study of the Universe.
Last March, the team behind the BICEP2 project made a ground-breaking announcement: the Antarctic observatory had detected a signal referable to gravitational waves. The study said they excluded possible contaminants - other sources that could have generated the same signal - and that the observation was valid.
Preliminary results from a recent study show that a blood test, when used in psychiatric patients experiencing symptoms that are considered to be indicators of a high risk for psychosis, identifies those who later went on to develop psychosis.
It may lead to accurate diagnosis of people who are experiencing the earliest stages of psychosis. Psychosis includes hallucinations or delusions that define the development of severe mental disorders such as schizophrenia. Schizophrenia emerges in late adolescence and early adulthood and affects about 1 in every 100 people. In severe cases, the impact on a young person can be a life compromised, and the burden on family members can be almost as severe.
Do kids of "tiger moms" - the term used by culture for demanding mothers in Asian families and popularized due to the 2011 book "Battle Hymn of the Tiger Mother" by Amy Chua - have lower self-esteem?
Not if the halls of Caltech are any indication. And do we need more young people with high levels of self-esteem living with their parents in their 30s? Regardless, a new paper in
the Journal of Family Issues finds that less supportive and punitive parenting techniques used by some Chinese parents might lead to the development of low self-esteem and school adjustment difficulties, leaving kids vulnerable to depression and problem behaviors.
By Tim Dean
UNDERSTANDING RESEARCH: What do we actually mean by research and how does it help inform our understanding of things? We begin today by looking at the origins of research.-->
In a global warming scenario, large areas of sea ice melt in the summer and when sea ice freezes over in the winter it is thinner and more reduced.
But warmer Arctic summers could lead to an acceleration of global warming, because reduced sea ice in the Arctic will remove less CO2 from the atmosphere, Danish scientists report.
"If our results are representative, then sea ice plays a greater role than expected, and we should take this into account in future global CO2 budgets", says Dorte Haubjerg Søgaard, PhD Fellow, Nordic Center for Earth Evolution, University of Southern Denmark and the Greenland Institute of Natural Resources, Nuuk.
A person's face is the first thing that others see, and much remains unknown about how it forms — or malforms — during early development. Recently, Chong Pyo Choe, a senior postdoctoral fellow working in the lab of USC stem cell researcher Gage Crump, has begun to unwind these mysteries.
In a September study published in the journal Development, Choe and Crump describe how a mutation in a gene called TBX1 causes the facial and other deformities associated with DiGeorge syndrome.
By Jessamy Gleeson, Swinburne University of Technology
Three weeks ago, well-known feminist gaming critic Anita Sarkeesian was forced to leave her San Francisco home due to an ongoing tirade of abuse and threats. Members of a vocal minority of online trolls had threatened to kill her parents, drink her blood, and rape her – all while publishing her personal details online.-->
Carbon dioxide emissions, the greenhouse gas that has been most strongly implicated in global warming, will reach a record high of 40 billion tons.
Physicists at the University of Geneva have succeeded in teleporting the quantum state of a photon to a crystal over 25 kilometers of optical fiber.
The experiment shatters the previous record of 6 kilometers achieved 10 years ago by the same team. Passing from light into matter, using teleportation of a photon to a crystal, shows that, in quantum physics, it is not the composition of a particle which is important, but rather its state, since this can exist and persist outside such extreme differences as those which distinguish light from matter.
The latest experiments have enabled verifying that the quantum state of a photon can be maintained whilst transporting it into a crystal without the two coming directly into contact.