Please create an account to participate in the Slashdot moderation system

 



Forgot your password?
typodupeerror
Check out the new SourceForge HTML5 internet speed test! No Flash necessary and runs on all devices. ×

Submission + - New formula massively reduces prime number memory requirements.

grcumb writes: Peruvian mathematician Harald Helfgott made his mark on the history of mathematics by solving Goldbach's Weak Conjecture, which every odd number greater than 5 can be expressed as the sum of three prime numbers. Now, according to Scientific American, he's found a better solution to the Sieve of Erasthones:

In order to determine with this sieve all primes between 1 and 100, for example, one has to write down the list of numbers in numerical order and start crossing them out in a certain order: first, the multiples of 2 (except the 2); then, the multiples of 3, except the 3; and so on, starting by the next number that had not been crossed out. The numbers that survive this procedure will be the primes. The method can be formulated as an algorithm.

But now, Helfgott has found a method to drastically reduce the amount of RAM required to run the algorithm:

Helfgott was able to modify the sieve of Eratosthenes to work with less physical memory space. In mathematical terms: instead of needing a space N, now it is enough to have the cube root of N.

So what will be the impact of this? Will we see cheaper, lower-power encryption devices? Or maybe quicker cracking times in brute force attacks?

Submission + - Firefox 49 Postponed One Week Due to Unexpected Bugs (softpedia.com)

An anonymous reader writes: Mozilla has announced this week that it is delaying the release of Firefox 49 for one week to address two unexpected bugs. Firefox 49, which was set for release on Tuesday, September 13, will now launch the following Tuesday, on September 20.

Work on fixing the two issues is ongoing. The first is a problem with a slow browser script, which is also the most time-consuming issue since the Mozilla team needs around a week of telemetry data to evaluate the fix. This is also the primary reason they've delayed Firefox 49 in the first place. The second problem relates to loading Giphy GIF images on Twitter, which open in a new blank page instead of the Giphy URL. This issue was first detected in Firefox 49 Beta releases.

Firefox 49 is an important release in Mozilla's grand scheme of things when it comes to Firefox. This is the version when Mozilla will finish multi-process support rollout (a.k.a. e10s, or Electrolysis), and the version when Firefox launches the new WebExtensions API that replaces the old Add-ons API, making Firefox compatible with Chromium extensions.

Submission + - Robot Sews 1st Garment (theindustrylondon.com)

An anonymous reader writes: A startup is announcing that they have used a robot to sew a T-shirt, producing the world’s first robotically-sewn garment. Despite decades of work and millions of research dollars, robots still can’t reliably handle fabrics. Sewbo figured out how to temporarily stiffen materials, making it easy for industrial robots to assemble clothes. This milestone marks the start of significant changes for the global garment industry.

Comment Re:Nice as a default, not as a mandate (Score 1) 275

Oh, to make things worse, they didn't announce this until AFTER the free Windows 10 upgrade period is over. Users who kept Windows 7/8/8.1 specifically so they could manage updates individually are going to be calling "foul" over this.

It's still available from the assistive technologies page. You have to vouch that you use assistive technologies, but there's no proof required, and under the circumstances there's no reason to feel guilty (but using the magnifier for a few seconds once a year technically qualifies if that's a problem).

Comment SSA needs to improve password policy (Score 2) 37

There is an undocumented 20-character limit on password length. Any longer password meeting all stated requirements is rejected (repeating only the stated requirements, not the actual reason). Although since the password has to be changed every 180 days, that's probably not enough time to crack it, if all printable characters are used (one can use a strong random username to add security, though). I'd rather be allowed to use an arbitrarily long password and not have to change it at all.

Submission + - Secure Skype alternatives 1

An anonymous reader writes: I have a Windows 8.1 phone and mostly use it for Skype calls and chats. A bit of browsing every now and then, and checking public transportation schedules. Nothing fancy in other words.

What can I do to be able to securely chat and place audio/video calls? What do you think is the best device to buy and what apps to use on it?

Submission + - Is Cortana spying on us? 2

siamesevodka writes: I just got the anniversary update installed [windows 10] and noticed cortana is installed again.I seen it was active again and wondered why. So I remembered it was hard for me uninstall or shut off the last time. So I asked cortana how to uninstall it. It replied that the anniversary update made sure it was permanently installed. So does this thing spy on us now even if we don't use it? Is it a back door for the NSA to keep tabs on me? Is microsoft whoring me out with their "free" software ? Is there a way to still shut it completely off or is George Orwell right?

Submission + - Solar Impulse completes solar-powered flight around the world

MikeChino writes: After 558 hours of total flight time, a solar-powered airplane just finished a record-shattering trip around the world. The Solar Impulse landed in Abu Dhabi at 4:05 am this morning, completing the final leg of an adventure spanning 43,041 kilometers. Upon landing and exiting the cockpit, Piccard said: “This is not only a first in the history of aviation; it’s before all a first in the history of energy. I’m sure that within 10 years we’ll see electric airplanes transporting 50 passengers on short to medium haul flights."

Submission + - Windows 10 Anniversary Update To Take Hassle Out Of Reactivating After Upgrades (hothardware.com)

MojoKid writes: Microsoft is cooking up some nifty feature enhancements to Windows 10 that will roll out with the much anticipated Anniversary Update later this summer. One of the newest tweaks will make it easier to perform hardware upgrades, such as a motherboard or hard drive, as you won't have to dial up a support representative and explain why your license should still be valid. The activation tweak is also being rolled out preview build 14371 to Windows Insiders in the Fast ring. It's part of what Microsoft is calling the "Activation Troubleshooter," which is intended to address user feedback from Windows Insiders who've run into activation issues on Genuine Windows devices after making certain hardware changes. You can launch the tool by going to Settings > Update & security > Activation and select Troubleshoot.

Submission + - Why Drones Could Save Door-To-Door Mail Delivery (vice.com)

An anonymous reader writes: Online shopping aside, people don't have as many physical items to mail as they used to, which is largely the reason why Canada Post announced it would be phasing out door-to-door mail delivery. Motherboard reports: "The corporation is exploring future use of drone technology to make deliveries, according to a report from the Canadian Press. At this point, Canada Post is engaging in a 'proper exercise,' a spokesperson told the Canadian Press, adding that the project is in its earliest, experimental stages. According to Graham Scott, the deputy editor of Canadian Business, even if mail-delivering drones remain a theoretical concept for now, it's inevitable they'll be considered as a way to drive costs down. There are many good reasons why mail delivery drones may never get off the ground. For one thing, current technology limits them to delivering one item of post at a time, which is tremendously impractical. But, as we've seen with the rolling out of community mailboxes — a program that was put on hold earlier this year when the review was launched — the invisible hand of the market is always looking to drive costs down. So don't count out flying robot deliveries for good. From a manager's perspective at least, drones have their advantages. They don't suffer from dog bites, and they (ideally) don't deviate from their routes. 'Drones don't twist their ankle, they don't get tired, and they don't form a union.' said Scott."

Submission + - Pay cash for healthcare and save a fortune (latimes.com)

schwit1 writes: Because of the skyrocketing costs for healthcare, it is now far cheaper to simply pay cash for many medical procedures, bypassing health insurance completely.

“This is one of the dirty little secrets of healthcare,” said Gerald Kominski, director of the UCLA Center for Health Policy Research. “If your insurance has a high deductible, you should always ask the cash price.”

Cash prices are intended for uninsured patients — and are frequently still much higher than insured rates. But cash prices for many common procedures have come down thanks to changing regulations and consumers increasingly being able to shop around for cheaper providers. Blood tests can be performed at CVS MinuteClinics and other pharmacies, for instance. Or as I reported a few years ago, MRIs are available from independent providers for as little as $300, whereas many hospitals will charge thousands of dollars.

The article’s main example is the case where the cost for blood tests, through insurance, was more than $80, while the cash price was only $15, and was still sufficient for the lab to make a profit.

Slashdot Top Deals

There is no royal road to geometry. -- Euclid

Working...