cartechboy writes "Lets just say Elon Musk may need to go battery shopping, like, big-time. Here's some little-understood Tesla math that could turn the global market for cylindrical lithium-ion cells upside down by 2015. It turns out the massive Model S battery takes almost 2,000 times the number of cells a basic laptop does. Assume Tesla just doubles production from its current 21K cars/year to 40K cars/year. (Something it expects to do by 2015). At that point, Tesla would require the *entire* existing global capacity for 18650 commodity cells. That assumes no other growth, no next gen model, nada. What should Elon do? Better get on the horn to Panasonic and Samsung."

theodp writes "Forget the dire predictions of a looming shortfall of scientists, technologists, engineers, and mathematicians, advises IEEE Spectrum contributing editor Robert Charette — the STEM crisis is a myth. In investigating the simultaneous claims of both a shortage and a surplus of STEM workers, Charette was surprised by 'the apparent mismatch between earning a STEM degree and having a STEM job. Of the 7.6 million STEM workers counted by the Commerce Department, only 3.3 million possess STEM degrees. Viewed another way, about 15 million U.S. residents hold at least a bachelor's degree in a STEM discipline, but three-fourths of them — 11.4 million — work outside of STEM.' So, why would universities, government, and tech companies like Facebook, IBM, and Microsoft cry STEM-worker-shortage-wolf? 'Clearly, powerful forces must be at work to perpetuate the cycle,' Charette writes. 'One is obvious: the bottom line. Companies would rather not pay STEM professionals high salaries with lavish benefits, offer them training on the job, or guarantee them decades of stable employment. So having an oversupply of workers, whether domestically educated or imported, is to their benefit...Governments also push the STEM myth because an abundance of scientists and engineers is widely viewed as an important engine for innovation and also for national defense. And the perception of a STEM crisis benefits higher education, says Ron Hira, because as 'taxpayers subsidize more STEM education, that works in the interest of the universities' by allowing them to expand their enrollments. An oversupply of STEM workers may also have a beneficial effect on the economy, says Georgetown's Nicole Smith, one of the coauthors of the 2011 STEM study. If STEM graduates can't find traditional STEM jobs, she says, 'they will end up in other sectors of the economy and be productive.'"

An anonymous reader writes "Professors at the Ohio State University are embracing MOOCs, with a Massive Open Online Calculus Course — it is completely open source; everything is on github. There is are free videos, free online assessment system, and a free textbook!"

ananyo writes "Facebook can lose a few users and remain a perfectly stable network, but where the national grid is concerned, simple geography dictates that it is always just a few transmission lines from collapse, according to a mathematical study of spatial networks. The upshot of the study is that spatial networks are necessarily dependent on any number of critical nodes whose failure can lead to abrupt — and unpredictable — collapse. The warning comes ten years after a blackout that crippled parts of the midwest and northeastern United States and parts of Canada. In that case, a series of errors resulted in the loss of three transmission lines in Ohio over the course of about an hour. Once the third line went down, the outage cascaded towards the coast, cutting power to some 50 million people. The authors say that this outage is an example of the inherent instability the study describes. But others question whether the team's conclusions can really be extrapolated to the real world. 'The problem is that this doesn't reflect the physics of how the power grid operates,' says Jeff Dagle, an electrical engineer at the Pacific Northwest National Laboratory in Richland, Washington, who served on the government task force that investigated the 2003 outage."

slew writes "Apparently none of the 24K+ students who sat for the 2013 Liberia University entrance exam got a passing mark, and fewer than a hundred managed to pass either the english (pass level 70%) or math (pass level 50%) sections required to qualify to be part of the normal class of 2k-3k students admitted every year... Historically, the pass rate has been about 20-30% and in recent years, the test has been in multiple-guess format to facilitate grading. The mathematics exam generally focuses on arithmetic, geometry, algebra, analytical geometry and elementary statistic and probability; while the English exam generally focuses on grammar, sentence completion, reading comprehension and logical reasoning. However, as a testament to the over-hang of a civil war, university over-crowding, corruption, social promotion, the admission criteria was apparently temporarily dropped to 40% math and 50% English to allow the provisional admission of about 1.6K students. And people are calling foul."

the_newsbeagle writes "Japanese researchers are trying to develop an artificial intelligence program that can pass the standardized test required of all college-bound high school students. Interestingly, the AI is showing good progress in the history portion of the exam, because it's fairly adept at looking up answers in a vast textual database. But the so-called Todai Robot is having trouble with math, 'because the questions are presented as word problems, which the Todai Robot must translate into equations that it can solve,' as well as with physics, which 'presumes that the robot understands the rules of the universe.' If the AI does succeed in mastering the general university exam, researchers will next tackle the notoriously difficult University of Tokyo entrance exam, which will require the bot to write essays."

A group of researchers from MIT and the University of Ireland has presented a paper (PDF) showing that one of the most important assumptions behind cryptographic security is wrong. As a result, certain encryption-breaking methods will work better than previously thought. "The problem, Médard explains, is that information-theoretic analyses of secure systems have generally used the wrong notion of entropy. They relied on so-called Shannon entropy, named after the founder of information theory, Claude Shannon, who taught at MIT from 1956 to 1978. Shannon entropy is based on the average probability that a given string of bits will occur in a particular type of digital file. In a general-purpose communications system, that’s the right type of entropy to use, because the characteristics of the data traffic will quickly converge to the statistical averages. ... But in cryptography, the real concern isn't with the average case but with the worst case. A codebreaker needs only one reliable correlation between the encrypted and unencrypted versions of a file in order to begin to deduce further correlations. ... In the years since Shannon’s paper, information theorists have developed other notions of entropy, some of which give greater weight to improbable outcomes. Those, it turns out, offer a more accurate picture of the problem of codebreaking. When Médard, Duffy and their students used these alternate measures of entropy, they found that slight deviations from perfect uniformity in source files, which seemed trivial in the light of Shannon entropy, suddenly loomed much larger. The upshot is that a computer turned loose to simply guess correlations between the encrypted and unencrypted versions of a file would make headway much faster than previously expected. 'It’s still exponentially hard, but it’s exponentially easier than we thought,' Duffy says."

holy_calamity writes "The two encryption systems used to secure the most important connections and digital files could become useless within years, reports MIT Technology Review, due to progress towards solving the discrete logarithm problem. Both RSA and Diffie-Hellman encryption rely on there being no efficient algorithm for that problem, but French math professor Antoine Joux has published two papers in the last six months that suggest one could soon be found. Security researchers that noticed Joux's work recommend companies large and small begin planning to move to elliptic curve cryptography, something the NSA has said is best practice for years. Unfortunately, key patents for implementing elliptic curve cryptography are controlled by BlackBerry."

sciencehabit writes "Lying in bed, unable to move a muscle, so-called locked-in patients have few ways to communicate with the outside world. But researchers have now found a way to use the widening and narrowing of the pupils to send a message, potentially helping these patients break the silence. The trick is a webcam-like setup that tracks pupil dilation. When people focus on a hard problem--say a math problem--their pupils dilate. Employing the approach, some locked-in patients could answer 'yes' and 'no' questions just by dilating their eyes."

raque writes "The NY Times recently published two op-eds in their Philosophy section, The Stone, discussing how Heisenberg's Uncertainty principle is abused. The second is a followup to the first. The author struggled to make clear his point and left the impression he was creating a strawman argument. In his followup he said he was avoiding equations because he was writing for a general audience. I replied to both articles, asking whether showing some basic equations would have worked better, allowing math to illustrate where metaphors struggled. Now I'm asking the same question to everyone on Slashdot. Would Dr. Callendar have been better off just diving in and dealing with Heisenberg and quantum mechanics using the tools that were developed for it?"

theodp writes "As noted earlier, Microsoft is tackling the CS education crisis with a popularity contest that will award $100K in donations to five technology education nonprofits that help make kids technically literate. Hopefully, the nonprofits will teach kids that the contest's voting Leader Board is a particularly good example of what-not-to-do technically. In addition to cherry-picking the less-pathetic vote totals to make its Leader Board, Microsoft also uses some dubious rounding code that transforms the original voting data into misleading percentages. Indeed, developer tools reveal that the top five leaders in the Microsoft STEM education contest miraculously account for 130% of the vote. Let's hope the quality control is better for those Microsoft Surface voting machines!"

knorthern knight writes "Most major weather services (US NWS, Britain's Met Office, etc) have their own supercomputers, and their own weather models. But there are some models which are used globally. A new paper has been published, comparing outputs from one such program on different machines around the world. Apparently, the same code, running on different machines, can produce different outputs due to accumulation of differing round-off errors. The handling of floating-point numbers in computing is a field in its own right. The paper apparently deals with 10-day weather forecasts. Weather forecasts are generally done in steps of 1 hour. I.e. the output from hour 1 is used as the starting condition for the hour 2 forecast. The output from hour 2 is used as the starting condition for hour 3, etc. The paper is paywalled, but the abstract says: 'The global model program (GMP) of the Global/Regional Integrated Model system (GRIMs) is tested on 10 different computer systems having different central processing unit (CPU) architectures or compilers. There exist differences in the results for different compilers, parallel libraries, and optimization levels, primarily due to the treatment of rounding errors by the different software systems. The system dependency, which is the standard deviation of the 500-hPa geopotential height averaged over the globe, increases with time. However, its fractional tendency, which is the change of the standard deviation relative to the value itself, remains nearly zero with time. In a seasonal prediction framework, the ensemble spread due to the differences in software system is comparable to the ensemble spread due to the differences in initial conditions that is used for the traditional ensemble forecasting.'"

An anonymous reader writes "The 233-year old American Academy of Arts and Sciences has announced that its longtime President and Chief Executive, Leslie Cohen Berlowitz, has agreed to resign effective at the end of this month following an investigation of charges of resume embellishment and other misconduct. Berlowitz falsely claimed to have received a doctorate from New York University, and has also been criticized for her behavior towards scholars and subordinates, and for her compensation package ($598,000 for 2012) relative to the size of the non-profit organization she led. The Academy, based in Cambridge MA, was founded during the American Revolutionary War and is one of the most prestigious honorary societies for the American intellectual elite, extending across math and science, arts and letters, business, law and public affairs. The active membership rolls contain people you've heard of; the incoming class list provides a more manageable glimpse of the society's breadth."

coolnumbr12 writes "A 2009 study (PDF) by the McAfee estimated that hacking costs the global economy $1 trillion. It turns out that number was a massive exaggeration by McAfee, a software security branch of Intel that works closely with the U.S. government at the local, state and federal level. A new estimate by the Center for Strategic and International Studies (and underwritten by McAfee) suggests the number is closer to closer to $300 billion (PDF), but even that much is uncertain. One of McAfee's clients, the Department of Defense, has used the $1 trillion estimate to argue for an expansion of cybersecurity, including 13 new teams dedicated to cyberwarfare. Despite the new data, Reuters said McAfee is still trying to exaggerate the numbers." The $1 trillion study has seen other criticism as well, so the new data is a step in the right direction.

Nerval's Lobster writes "In June, Steven Spielberg predicted that Hollywood was on the verge of an 'implosion' in which 'three or four or maybe even a half-dozen megabudget movies are going to go crashing to the ground.' The resulting destruction, he added, could change the film industry in radical and possibly unwelcome ways. And sooner than he may have thought, the implosion has arrived: in the past couple weeks, six wannabe blockbusters have cratered at the North American box office: 'R.I.P.D.,' 'After Earth,' 'White House Down,' 'Pacific Rim,' and 'The Lone Ranger.' These films featured big stars, bigger explosions, and top-notch special effects—exactly the sort of summer spectacle that ordinarily assures a solid run at the box office. Yet all of them failed to draw in the massive audiences needed to earn back their gargantuan budgets. Hollywood's more reliant than ever on analytics to predict how movies will do, and even Google has taken some baby-steps into that arena with a white paper describing how search-query patterns and paid clicks can estimate how well a movie will do on its opening weekend, but none of that data seems to be helping Hollywood avoid shooting itself in the foot with a 'Pacific Rim'-sized plasma cannon. In other words, analytics can help studios refine their rollout strategy for new films—but the bulk of box-office success ultimately comes down to the most elusive and unquantifiable of things: knowing what the audience wants before it does, and a whole lot of luck."

HonorPoncaCityDotCom writes "The gift for spatial reasoning — the kind that may inspire an imaginative child to dismantle a clock or the family refrigerator — is sometimes referred to as the 'orphan ability' for its tendency to go undetected. Now Douglas Quenqua reports that according to a study published in the journal Psychological Science, spatial ability may be a greater predictor of future creativity or innovation than math or verbal skills, particularly in math, science and related fields. 'Evidence has been mounting over several decades that spatial ability gives us something that we don't capture with traditional measures (PDF) used in educational selection,' says David Lubinski, the lead author of the study and a psychologist at Vanderbilt. 'We could be losing some modern-day Edisons and Fords.' Spatial ability can be best defined as the ability to 'generate, retain, retrieve, and transform well-structured visual images.' Some examples of great inventors who have used their high levels of spatial ability to innovate include James Watt, who is known for improving the steam engine, and James Watson, co-discoverer of the structure of DNA. Nikola Tesla, who provided the basis for alternating current (AC) power systems, is said (or fabled) to have been able to visualize an entire working engine in his mind and be able to test each part over time to see what would break first. Testing spatial aptitude is not particularly difficult but is simply not part of standardized testing because it is considered a cognitive function — the realm of I.Q. and intelligence tests — and is not typically a skill taught in school. 'It's not like math or English, it's not part of an academic curriculum,' says Dr. David Geary. 'It's more of a basic competence. For that reason it just wasn't on people's minds when developing these tests.'"

New submitter LFSim writes "It's not the Turing test just yet, but in one more domain, AI is becoming increasingly competitive with humans. This time around, it's in interplanetary trajectory optimization. From the European Space Agency comes the news that researchers from its Advanced Concepts Team have recently won the Gold 'Humies' award for their use of Evolutionary Algorithms to design a spacecraft's trajectory for exploring the Galilean moons of Jupiter (Io, Europa, Ganymede and Callisto). The problem addressed in the awarded article (PDF) was put forward by NASA/JPL in the latest edition of the Global Trajectory Optimization Competition. The team from ESA was able to automatically evolve a solution that outperforms all the entries submitted to the competition by human experts from across the world. Interestingly, as noted in the presentation to the award's jury (PDF), the team conducted their work on top of open-source tools (PaGMO / PyGMO and PyKEP)."

New submitter ulatekh writes "San Jose State University is suspending a highly touted collaboration with online provider Udacity to offer low-cost, for-credit online courses after finding that more than half of the students failed to pass the classes. 'Preliminary results from a spring pilot project found student pass rates of 20% to 44% in remedial math, college-level algebra and elementary statistics courses. In a somewhat more promising outcome, 83% of students completed the classes.'"

Frequent contributor Bennett Haselton proposes a new use for online, anonymous voting: helping sort skill from luck in the cheek-by-jowl world of best-selling (and would-be best-selling) authors: "J.K. Rowling recently confirmed that she was the author of a book she had published under a pseudonym, which spiked in sales after she was outed as the true author. Perhaps she was doing an experiment to see how much luck had played a role in propelling her to worldwide success, and whether she could recreate anything close to that success when starting from scratch. But a better way to answer that question would be to strike a deal with an amateur-fiction-hosting site and use the random-sample-voting algorithm that I've written so much about, to test how her writing stacks up against other writers in the same genre." Read on for more. Update: 07/20 01:23 GMT by T : Note: An editorial goof (mine) swapped out the word "confirmed" for "revealed" (above) in an earlier rendering of this story.

itwbennett writes "The only thing that's noteworthy about Microsoft CEO Steve Ballmer's recent disclosure that the company has one million servers in its data centers is that he decided to disclose it — most of the industry giants like to keep that information to themselves, says ITworld's Nancy Gohring. But just for fun, Amazon Web Services engineer James Hamilton did the math: One million servers equals 15–30 data centers, a $4.25 billion capital expense, and power consumption of 2.6TWh annually, or the amount of power that would be used by 230,000 homes in the U.S. Whether this is high or low, good or bad is impossible to know without additional metrics."