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Medicine

Laser Eye Surgery, Revisited 10 Years Later 541

Posted by Unknown Lamer
from the waiting-for-the-laser-vision-option dept.
gunner_von_diamond (3461783) happened upon Ask Slashdot: Experiences with Laser Eye Surgery from ten years ago, and asks: I was just reading a story on /. from 10 years ago about Lasik Eye Surgery. Personally, I've had Lasik done and loved every single part of the surgery. I went from wearing contacts/glasses every day to having 20/15 vision! In the older post, everyone seemed to be cautious about it, waiting for technical advances before having the surgery. Today, the surgery is fairly inexpensive [even for a programmer :) ], takes about 10-15 minutes, and I recovered from the surgery that same day. So my question is: what is holding everyone else back from freeing themselves from contacts and glasses?
Shark

NIF Compresses Diamonds With 50 Million Atmospheres of Pressure 81

Posted by Unknown Lamer
from the memories-bring-diamonds-and-lasers dept.
sciencehabit (1205606) writes The world's largest laser [the National Ignition Facility], a machine that appeared as the warp core in 'Star Trek into Darkness', has attained a powerful result: It's squeezed diamond, the least compressible substance known, 50 million times harder than Earth's atmosphere presses down on us. ... As the researchers report online today in Nature, the x-ray assault nearly quadrupled the diamond's density. "That's a record," Smith [one of the researchers] says. "No one's compressed diamond to that extent before." The blast pulverized the diamond into dust, but before the mineral's destruction the scientists successfully measured its density ... For a billionth of a second, the diamond, which is normally 3.25 times denser than water, became ... 12.03 times denser than water. ... Scientists have speculated that diamond worlds may exist elsewhere. If a solar system arises with more carbon than oxygen, then carbon should soak up the oxygen by forming carbon monoxide, leaving excess carbon to create carbon planets—which, under pressure, become diamond worlds. Thus, Smith says, the new experiment will probe the nature of such planets. They are performing similar experiments with iron in an attempt to understand the properties of super-Earth cores.
Shark

Shark! New Sonar Buoy Will Warn Beachgoers When Large Sharks Are Near 55

Posted by Soulskill
from the will-also-summon-the-ghost-of-roy-scheider dept.
stephendavion writes: While the risk of being attacked by a shark is certainly low, it's one of those terrors that can weigh heavily on the mind of a beach-goer, particularly in higher-risk beaches such as those in Australia and South Africa. A new device is currently being developed to warn swimmers when a shark is detected in the water near a beach, and — no surprise — the Aussies are behind it. The Clever Buoy is being called the "world's first shark detection buoy" by its developers. The project is a collaboration between Australian telecommunications company Optus and marine safety company Shark Attack Mitigation Systems.
Shark

Great White Sharks Making Comeback Off Atlantic Coast 107

Posted by samzenpus
from the just-when-you-thought-it-was-safe-to-go-back-in-the-water dept.
An anonymous reader writes "A report that scientists are calling one of the most comprehensive studies of great white sharks finds their numbers are surging in the ocean off the Eastern U.S. and Canada after decades of decline — bad news if you're a seal, but something experts say shouldn't instill fear. The scientists behind the study attribute the resurgence to conservation efforts, such as a federal 1997 act that prevented hunting of great whites, and greater availability of prey. The species is listed as vulnerable by the International Union for Conservation of Nature."
Shark

Public Interest In Great White Shark Devours Research Site's Servers 57

Posted by Soulskill
from the we're-gonna-need-a-bigger-load-balancer dept.
Lucas123 writes: Katherine, a 14-foot, 2,300lb. Great White Shark, has become so popular with visitors to a research site tracking her daily movements that the site's servers have crashed and remained down for hours. The shark, one of dozens tagged for research by the non-profit global shark tracking project OCEARCH, typically cruises very close to shore up and down the Eastern Seaboard. That has attracted a lot interest from the swimming public. Currently, however, she's heading from Florida's west coast toward Texas. OCEARCH tags sharks with four different technologies to create a three-dimensional image of a shark's activities. "On average, we're collecting 100 data points every second — 8.5 million data points per day."
ISS

NASA Beams Hi-Def Video From Space Via Laser 38

Posted by samzenpus
from the beam-it-down dept.
An anonymous reader writes "NASA successfully beamed a high-definition video 260 miles from the International Space Station to Earth Thursday using a new laser communications instrument. Transmission of 'Hello, World!' as a video message was the first 175-megabit communication for the Optical Payload for Lasercomm Science (OPALS), a technology demonstration that allows NASA to test methods for communication with future spacecraft using higher bandwidth than radio waves." Last September, NASA's LADEE (Lunar Atmosphere and Dust Environment Explorer) showed that they could supply a lunar colony with broadband via lasers.
Shark

Is There a Limit To a Laser's Energy? 135

Posted by timothy
from the of-course-there-isn't dept.
StartsWithABang (3485481) writes "For normal matter — things like protons, neutrons and electrons — there's a fundamental limit to the number of particles you can fit into a given region of space thanks to the Pauli exclusion principle. But photons aren't subject to that limit; in theory, you could cram an infinite number of them into the same exact state. In principle, then, couldn't you create a laser (or lasing cavity) with an infinite amount of energy inside? Perhaps, but there are some big challenges to be overcome!"
Shark

Lasers May Solve the Black Hole Information Paradox 75

Posted by Soulskill
from the is-there-any-problem-lasers-can't-solve dept.
astroengine writes: "In an effort to help solve the black hole information paradox that has immersed theoretical physics in an ocean of soul searching for the past two years, two researchers have thrown their hats into the ring with a novel solution: Lasers. Technically, we're not talking about the little flashy devices you use to keep your cat entertained, we're talking about the underlying physics that produces laser light and applying it to information that falls into a black hole. According to the researchers, who published a paper earlier this month to the journal Classical and Quantum Gravity (abstract), the secret to sidestepping the black hole information paradox (and, by extension, the 'firewall' hypothesis that was recently argued against by Stephen Hawking) lies in stimulated emission of radiation (the underlying physics that generates laser light) at the event horizon that is distinct from Hawking radiation, but preserves information as matter falls into a black hole."
Stats

'Data Science' Is Dead 139

Posted by Unknown Lamer
from the data-however-is-the-lucasian-chair dept.
Nerval's Lobster writes "If you're going to make up a cool-sounding job title for yourself, 'Data Scientist' seems to fit the bill. When you put 'Data Scientist' on your resume, recruiters perk up, don't they? Go to the Strata conference and look on the jobs board — every company wants to hire Data Scientists. Time to jump aboard that bandwagon, right? Wrong, argues Miko Matsumura in a new column. 'Not only is Data Science not a science, it's not even a good job prospect,' he writes. 'Companies continue to burn millions of dollars to collect and gamely pick through the data under respective roofs. What's the time-to-value of the average "Big Data" project? How about "Never?"' After the 'Big Data' buzz cools a bit, he argues, it will be clear to everyone that 'Data Science' is dead and the job function of 'Data Scientist' will have jumped the shark."
Education

Code.org Resurrects 'Flappy Bird' As Programming Lesson 72

Posted by timothy
from the keeping-up-with-the-times dept.
Nerval's Lobster writes "Flappy Bird might be kaput, but its hilariously awkward hero is serving another useful purpose in its afterlife: teaching people how to code. Flappy Bird, a free mobile game for Android and iOS that asks the player to guide the titular avian through an obstacle course of vertical pipes, became a sensation earlier this year, seizing the top spots on the Apple and Google Play app stores. Its creator, Dong Nguyen, said the game earned him an average of $50,000 a day through in-app advertising — but that didn't stop him from yanking the game offline in early February. Now Code.org has resurrected Flappy Bird, Phoenix-style, from the smoking wreckage, with a free tutorial that allows anyone with a bit of time to code his or her very own version of the game. There's no actual code to learn, thanks to a visual interface that allows budding developers to drag 'blocks' of commands into place. 'Flappy Bird recently met its untimely death. We might've been tempted to cry all day and give up on spreading computer science (not really, but R.I.P Flappy Bird),' read a note on Code.org's blog. 'Instead, we built a new drag-and-drop tutorial that lets you build your own Flappy game — whether it's Flappy Bird, or Flappy Easter Bunny, Flappy Santa, Flappy Shark with Lasers, Flappy Fairy or Flappy Underwater Unicorn.' Childish? Maybe. But it could help draw people into coding for fun or profit."
Education

"Shark Tank" Competition Used To Select Education Tech 57

Posted by timothy
from the would-you-prefer-the-texas-school-board? dept.
theodp writes "With support from the Bill & Melinda Gates Foundation and the tech billionaire-backed NewSchools Venture Fund, the Silicon Valley Education Foundation used a competition based on the reality show Shark Tank to determine which educational technology entrepreneurs would win the right to have teachers test their technology on students for the rest of the year. 'Ten companies, selected from 80 original applicants,' reports Mercury News columnist Mike Cassidy, 'had three minutes to convince a panel of educators and then a panel of business brains that their ideas would be a difference maker in middle school math classes.' The winners? Blendspace, which helps teachers create digital lessons using Web-based content; Front Row Education, which generates individual quizzes for students and tracks their progress as they work through problems; LearnBop, which offers an automated tutoring system with content written by math teachers; and Zaption, which lets teachers use existing online videos as lessons by adding quizzes, discussion sections, images and text."
Space

Researchers Unveil High-Speed Laser Communications Device For Space 40

Posted by samzenpus
from the saving-your-laser-minutes dept.
coondoggie writes "Using lasers to communicate quickly through the long distances of space has generally been the purview of science fiction. But researchers at the National Institute of Standards and Technology (NIST) and NASA's Jet Propulsion Laboratory (JPL) are out to change that notion with a prototype array (pdf) that can read more information — and allow much higher data rates than conventional systems — than usual from single particles of light. Lasers can transmit only very low light levels across vast distances, so signals need to contain as much information as possible, NASA said."
Technology

Five Easy Pieces: Short Product Presentations from CES 2014 (Video) 19

Posted by Roblimo
from the new-and-hungry-companies-are-often-more-interesting-than-big-bloated-ones dept.
At CES and other big trade shows, small companies and start-ups are often overshadowed by industry giants whose huge promotional budgets let them dominate a show's exhibit area. In this video, Tim Lord asked the spokespeople for five small companies exhibiting at CES whose products interested him to give one-minute presentations about their products. So take a quick look at the ZeroHour USB "tactical grade" battery backup flashlight; MadeSolid, a 3-D printing material company; TangoPC, "the world’s most powerful Pocketable, Officeable, Entertainmentable, Gameable, Windowsable, Linuxable PC; Google Glass competitor GlassUp; and DoorBot, "the doorbell for smartphones," which was featured on the ABC TV show Shark Tank in November, 2013. DoorBot got no investment from the "sharks," but managed to raise $1 million from "traditional technology investors." DoorBot's fundraising success aside, today's video is about companies that are unlikely to get much coverage from "mainstream" news channels that cover CES. If you don't see the video (probably because you're enjoying the thrill of Slashdot Beta), you can view it here.
Shark

Many Lasers Become One In Lockheed Martin's 30 kW Laser Weapon 202

Posted by Unknown Lamer
from the ready-main-phaser-array dept.
Zothecula writes "In another step forward for laser weapons that brings to mind the Death Star's superlaser, Lockheed Martin has demonstrated a 30-kilowatt fiber laser produced by combining many lasers into a single beam of light. According to the company, this is the highest power laser yet that was still able to maintain beam quality and electrical efficiency, paving the way for a laser weapon system suitable, if not for a Death Star, for a wide range of air, land, and sea military platforms."
Shark

Lasers Unearth Lost 'Agropolis' of New England 105

Posted by Soulskill
from the what-can't-laser-do dept.
sciencehabit writes "Hidden ruins are customary in the wild jungles of South America or on the white shores of the Mediterranean Sea. Now, researchers have uncovered a long-lost culture closer to Western civilization — in New England. Using aerial surveys created by LiDAR, a laser-guided mapping technique, the team detected the barely perceptible remnants of a former 'agropolis' around three rural New England towns (abstract). Near Ashford, Connecticut, a vast network of roads offset by stone walls came to light underneath a canopy of oak and spruce trees. More than half of the town has become reforested since 1870, according to historical documents, exemplifying the extent of the rural flight that marked the late 1800s. Some structures were less than 2 feet high and buried in inaccessible portions of the forest, making them essentially invisible to on-the-ground cartography."
Twitter

Western Australian Sharks Send Tweets To Swimmers 75

Posted by samzenpus
from the check-to-see-if-it's-safe-to-go-back-in-the-water dept.
Zothecula writes "More shark attacks occur in Western Australia than almost anyplace else on Earth. In order to help protect swimmers and surfers, the state government relies largely on helicopter-based spotters, plus members of the public who report their own sightings. Now, however, the Department of Fisheries has introduced a new system, in which the toothy fishes announce their own presence via Twitter. Known as the Shark Monitoring Network, the system utilizes acoustic tags that are attached to the fins of individual sharks, along with buoyed monitoring devices that pick up the signals transmitted by those tags. When a tagged shark swims within range of one of the monitors, its species, size and location is automatically recorded."
Games

Virtuix Omni is a Step Toward True Virtual Reality Gaming (Video) 87

Posted by Roblimo
from the let's-meet-on-the-holodeck-at-2100 dept.
The Virtuix Omni "is an omnidirectional treadmill video game peripheral for virtual reality games currently in development by Virtuix," says Wikipedia. With this device and an Oculus Rift, Razer Hydra or a similar "immersive" headset, you can play games equipped to use these devices with your whole body moving in any direction you choose. If you think you saw this product on the Shark Tank TV show or a pitch for it at Kickstarter.com, you're right. You did. The Virtuix Omni people have been pushing their product hard, everywhere they can. Tim ran into their product manager, Colton Jacobs, at the recent AppsWorld conference in London. This video is Tim's record of their conversation.
The Military

Army Laser Passes Drone-Killing Test 173

Posted by samzenpus
from the zap-it dept.
Nerval's Lobster writes "Commercial package-delivery drones such as those revealed by Amazon and DHL could face danger from more than shotgun-toting, UAV-hunting yahoos following the successful test of a drone-killing laser by the U.S. Army. Though it's more likely to take aim at enemy observation drones than Amazon's package-deliver 'copters, the U.S. Army's High Energy Laser Mobile Demonstrator (HEL-MD) did prove itself in tests last week by shooting down 90 incoming mortars and a series of Unmanned Aerial Vehicles (UAV). The original goal during the test at White Sands Missile Range in New Mexico was to burn out or blow up mortar rounds and blind the cameras or other sensors carried by drones. The laser proved capable enough to damage or slice off the tails of target drones, which brought them down, according to Terry Bauer, HEL MD program manager, as quoted in the Dec. 11 Army announcement of the test. The quarter-sized beam of super-focused light set off the explosives in the 60-millimeter mortars in mid-flight, leaving the rest to fall 'like a rock,' Bauer said. The laser could target only one mortar at a time, but could switch targets quickly enough to bring down several mortars fired in a single volley. The laser and its power source are contained in a single 500-horsepower, four-axle truck but was directed by a separate Enhanced Multi Mode Radar system. The next step is a move from New Mexico to a testing range in Florida early next year 'to test it in rain and fog and things like that,' according to Bauer."
Businesses

How Snapchat Could March Startups Right Off the Cliff, Lemming-Style 143

Posted by Unknown Lamer
from the take-their-money-while-you-still-can dept.
Nerval's Lobster writes "Two investors are Tweeting that Instagram, had it stayed an independent company, could be worth between $5 billion and $15 billion today. That's led to talk of whether Snapchat was right to (reportedly) shoot down Facebook's bid of $3 billion for its business, considering its growth and sizable user base. Snapchat's founders evidently think they can score a better deal within the next few quarters. If they manage to sell their startup a year from now for twice as much, they'll be lauded as extraordinarily smart businessmen—perhaps smarter than the folks at Instagram who sold for a 'measly' $1 billion (and all this despite Snapchat making no revenue). But for other startups in the space, the Snapchat and Instragram stories won't do them much good. Propelled by dreams of ever-increasing millions (perhaps billions!) startup founders could end up turning down perfectly good acquisition offers in favor of continuing to bootstrap — and find their businesses eroding and imploding, as the market for their particular app or service either fades away or (more likely) ends up crowded out by competing software. The startup market is a shark-tank, and most of those who don't get out of the water as soon as possible are eaten, dreams of grandeur or no."
Shark

New Technology For Converting a Metal To a Semiconductor With a Laser 42

Posted by samzenpus
from the presto-chango dept.
rtoz writes "Researchers at MIT have succeeded in producing and measuring a coupling of photons and electrons on the surface of an unusual type of material called a topological insulator. This type of coupling had been predicted by theorists, but never observed. The researchers suggest that this finding could lead to the creation of materials whose electronic properties could be 'tuned' in real time simply by shining precise laser beams at them. This work opens up a new avenue for optical manipulation of quantum states of matter. Their findings suggest that it's possible to alter the electronic properties of a material — for example, changing it from a conductor to a semiconductor — just by changing the laser beam's polarization. For example, a property called a bandgap — a crucial characteristic for materials used in computer chips and solar cells — can be altered by shining a polarized laser beam at the material."

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