sciencehabit writes in with a link about a group of students who have come up with an interesting idea about how to fill potholes. "Non-Newtonian fluids are the stars of high school science demonstrations. In one example, an ooey-gooey batter made from corn starch and water oozes like a liquid when moved slowly. But punch it, or run across a giant puddle of it, and it becomes stiff like a solid. Now, a group of college students has figured out a new use for the strange stuff: filler for potholes."
Want to read Slashdot from your mobile device? Point it at m.slashdot.org and keep reading!
coondoggie writes "When it comes to stirring the brains of genius, a good competition can bring forward some really great ideas. That's the driving notion behind myriad public competitions, or challenges, as they are often labeled, that will take place in the near future sponsored by the U.S. government. The competitions are increasing by design as part of the $45 billion America Competes Act renewed by Congress last year that gave every federal department and agency the authority to conduct prize competitions, according to the White House's Office of Science and Technology Policy."
samazon writes "Ph.D. students at Trinity College in Dublin have constructed an artificial neural network model to demonstrate the Machiavellian intelligence theory — that human intelligence evolved based on the need for social teamwork and indexing a variety of social relationships and statuses. (Abstract) The experiment involved programming a base group of 50 simulated 'brains' which were required to participate one of two classical game theory dilemmas — the Prisoner's Dilemma or the Snowdrift game. Upon completion of either game, each 'brain' produced 'offspring' asexually, with 'brains' that made more advantageous choices during the games programmed to have a better chance to reproduce. A potential random mutation during each generation changed the 'brain's structure, number of neurons, or the strengths of the connections between those neurons,' simulating the evolution of the social brain. After 50,000 generations, the model showed that as cooperation increased, so did the intelligence of the programmed brains." The full paper is available.
MrKevvy writes "The Tennessee 'Teaching the Controversy' bill was passed into law today. 'A law to allow public school teachers to challenge the scientific consensus on issues like climate change and evolution will soon take effect in Tennessee. State governor Bill Haslam allowed the bill — passed by the state House and Senate — to become law without signing it, saying he did not believe the legislation "changes the scientific standards that are taught in our schools."'" The governor adds: "However, I also don’t believe that it accomplishes anything that isn’t already acceptable in our schools."
You recently got the chance to ask a group of MIT researchers questions about fusion power, and they've now finished writing some incredibly detailed answers. They discuss the things we've learned about fusion in the past decade, how long it's likely to take for fusion to power your home, the biggest problems fusion researchers are working to solve, and why it's important to continue funding fusion projects. They also delve into the specifics of tokamak operation, like dealing with disruption events and the limitations on reactor size, and provide some insight into fusion as a career. Hit the link below for a wealth of information about fusion.
gbrumfiel writes "The Square Kilometre Array will be the world's most powerful telescope, assuming the nations involved can agree on where to build it. A scientific panel recently backed South Africa over Australia to host the project, but neither side has conceded defeat. Rather than splitting the partners, project leaders are now thinking about splitting the telescope between the two countries. There's little scientific advantage, but the thinking is that a split telescope would be better than no telescope."
Hugh Pickens writes "For more than a century, it has been accepted that about 620,000 Americans died in the the bloodiest, most devastating conflict in American history. But now, BBC reports that historian J. David Hacker has used sophisticated statistical software to determine the war's death toll and found that civil war dead may have been undercounted by as many as 130,000. Hacker began by taking digitized samples from the decennial census counts taken from 1850-1880. Using statistical package SPSS, Hacker counted the number of native-born white men of military age in 1860 and determined how many of that group were still alive in 1870 and compared that survival rate with the survival rates of the men of the same ages from 1850-1860, and from 1870-1880 — the 10-year census periods before and after the Civil War. The calculations yielded the number of 'excess' deaths of military-age men between 1860-1870 — the number who died in the war or in the five subsequent years from causes related to the war. Hacker's findings, published in the December 2011 issue of Civil War History, have been endorsed by some of the leading historians of the conflict. 'The difference between the two estimates is large enough to change the way we look at the war,' writes Hacker. 'The war touched more lives and communities more deeply than we thought, and thus shaped the course of the ensuing decades of American history in ways we have not yet fully grasped. True, the war was terrible in either case. But just how terrible, and just how extensive its consequences, can only be known when we have a better count of the Civil War dead.'"
New submitter RealTime writes "SpaceX filed a notice with the FAA (PDF) that it is preparing an environmental impact study in consideration of a site in Texas for use as a commercial spaceport. 'The site in question is in the southern tip of the state of Texas, just outside Brownsville in Cameron County, overlooking the Gulf of Mexico, over which SpaceX's launches would fly.' The proposed site would handle up to 12 commercial launches per year. 'There's plenty of red tape associated with Kennedy Space Center, and the center is often reserved for large blocks of time by other launchers. If SpaceX had its own pad, it wouldn't have to share.'"
An anonymous reader sends this quote from a NASA report: "One day in the fall of 2011, Neil Sheeley, a solar scientist at the Naval Research Laboratory in Washington, D.C., did what he always does — look through the daily images of the sun from NASA's Solar Dynamics Observatory (SDO). But on this day he saw something he'd never noticed before: a pattern of cells with bright centers and dark boundaries occurring in the sun's atmosphere, the corona. ... The coronal cells occur in areas between coronal holes – colder and less dense areas of the corona seen as dark regions in images -- and "filament channels" which mark the boundaries between sections of upward-pointing magnetic fields and downward-pointing ones. Understanding how these cells evolve can provide clues as to the changing magnetic fields at the boundaries of coronal holes and how they affect the steady emission of solar material known as the solar wind streaming from these holes."
judgecorp writes "Intel security subsidiary McAfee has claimed a successful wireless attack on insulin pumps that diabetics rely on to control blood sugar. While previous attempts to attack insulin pumps have met with mixed success, McAfee's Barnaby Jack says he has persuaded an insulin pump to deliver 45 days worth of insulin in one go, without triggering the pump's vibrating alert safety feature. All security experts still say that surgical implants are a benefit overall."
samazon writes "North Carolina State University researcher Jag Kasichainula has developed a 'heat spreader' to cool electronics more efficiently using a copper-graphene composite, which is attached using an indium-graphene interface film. According to Kasichainula, the technique will cool 25% faster than pure copper and will cost less to produce than the copper plate heat spreaders currently used by most electronics (abstract). Better performance at a lower cost? Let's hope so."
An anonymous reader writes with this news out of the University of Illinois: "Scientists report that they have mapped the physical architecture of intelligence in the brain. Theirs is one of the largest and most comprehensive analyses so far of the brain structures vital to general intelligence and to specific aspects of intellectual functioning, such as verbal comprehension and working memory. Their study, published in Brain: A Journal of Neurology (abstract), is unique in that it enlisted an extraordinary pool of volunteer participants: 182 Vietnam veterans with highly localized brain damage from penetrating head injuries. ... The researchers took CT scans of the participants’ brains and administered an extensive battery of cognitive tests. They pooled the CT data to produce a collective map of the cortex, which they divided into more than 3,000 three-dimensional units called voxels. By analyzing multiple patients with damage to a particular voxel or cluster of voxels and comparing their cognitive abilities with those of patients in whom the same structures were intact, the researchers were able to identify brain regions essential to specific cognitive functions, and those structures that contribute significantly to intelligence."
redletterdave writes "A new study suggests people who had certain kinds of dental X-rays in the past may be at an increased risk for meningioma, the most commonly diagnosed brain tumor in the U.S. Dr. Elizabeth Klaus, the study's lead author and a professor at the Yale School of Medicine, discovered that dental X-rays are the most common source of exposure to ionizing radiation — which has been linked to meningiomas in the past — and that those diagnosed with meningiomas were more than twice as likely as a comparison group to report ever having had bitewing images taken. And regardless of the age when the bitewings were taken, those who had them yearly or more frequently were between 40 percent and 90 percent higher risk at all ages to be diagnosed with a brain tumor."
coondoggie writes "Barring bad weather, NASA said the space shuttle Discovery mounted atop the space agency's 747 Shuttle Carrier Aircraft will make a series of low passes — 1,500 ft. — around parts of Washington DC on April 17 between 10-11 am eastern daylight time." Discovery will be on its way to the Smithsonian from Florida; this is a rare chance in the post-shuttle era for people to still see a shuttle in flight; I'm planning a marathon drive to reach the parking lot at the Steven F. Udvar-Hazy Center for what NASA's calling Shuttle Fly-In Day, in hopes of catching a glimpse.
slew writes "Looking at liquids with a transmission electron microscope to observe things like crystal growth has been difficult to do. This is because liquids need to be confined to a capsule to view them in a TEM (because the electrons are flying at the sample in a chamber near vaccuum pressures where liquids would evaporate or sublimate). Traditional capsules of Silicon Oxide or Silicon Nitride have been fairly opaque. A paper describes a new technique with a 'pocket' created between two graphene layers which can hold liquids for observation by a TEM and the graphene is apparently much more transparent than previous materials allowing a better view of the processes (like crystalization), taking place in the liquid. The BBC has a non-paywalled summary article."