Amanecer

Luces del amanecer caraqueño

Luces del amanecer caraqueño     Foto tomada justo antes de amanecer Mostrar detalle

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Energy

Low-cost solar cells poised for commercial breakthrough. by Robert F. Dec 2016 @sciencemagazine

Low-cost solar cells poised for commercial breakthrough. by Robert F. Dec  2016  @sciencemagazine     Cheap materials called perovskites are insinuating themselves into silicon solar cells—a first step toward ultimately usurping the reigning cell material. Last week, at a meeting here of the Materials Research Society (MRS), researchers announced that “tandem” cells, in which perovskites are layered on top of silicon and other photovoltaic materials, have achieved record-setting efficiencies at turning sunlight into electricity. Now, researchers are moving fast to surmount the lack of durability and other problems that have hindered the commercialization of perovskites. “I think perovskites are going to make it to market,” says Aslihan Babayigit, a perovskite researcher at Hasselt University in Diepenbeek, Belgium. The progress has been “amazing,” adds David Cahen, a materials scientist at the Weizmann Institute of Science in Rehovot, Israel. “Even if all the problems are not solved, most look solvable.” Mostrar detalle

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Police Asks ISPs To Block Tor

A hacker was able to gain control of multiple systems on the national grid.

A hacker was able to gain control of multiple systems on the national grid.     Japanese police has asked ISPs to start blocking Tor, an open source anonymizer, so that cyber-criminals can no longer rely on anonymous traffic to indulge in criminal activities online. Mostrar detalle

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Robots

Students like them, teachers less so: robots in classrooms. by @wef

Students like them, teachers less so: robots in classrooms.  by @wef     Robots are increasingly being used to teach students in the classroom for a number of subjects across science, maths and language. But our research shows that while students enjoy learning with robots, teachers are slightly reluctant to use them in the classroom. In our study, which saw staff and students interact with the Nao humanoid robot, teachers said they were more sceptical of robots being integrated into the classroom. They preferred the robot to not have full autonomy and instead take on restricted roles in the classroom. The teachers also wanted full control over the robot. We observed that the teachers were in general unaware of robots and hence there was a technological bias associated with their opinions. Mostrar detalle

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Followers

REASONS YOU DON´T HAVE MORE FOLLOWERS ON TWITTER

REASONS YOU DON´T HAVE MORE FOLLOWERS ON TWITTER     In general, people follow businesses on Twitter because they want something from them. If you´re not offering what they want they aren´t going to follow you and will more than likely follow your competitors instead. Image from http://www.schneiderb.com/ If you want to build your presence on Twitter and get ahead of your competitors use the infographic below from Search Engine People which gives you the top 8 things people want from businesses on Twitter. Mostrar detalle

ID: 272 C: 19 I: 2864 F: 9.706
    

Python generators

2 great benefits of Python generators (and how they changed me forever)

2 great benefits of Python generators (and how they changed me forever)     I had no idea how important it would turn out to be. It changed the way I wrote software forever, in every language. By "it," I mean a Python construct called generators. It´s hard to convey everything they can do for you in a few words; you´ll have to keep reading to find out. In a nutshell: they help your program efficiently scale, while at the same time providing delightful encapsulation patterns. Let me explain. Image from http://wikieducator.org/ Mostrar detalle

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Women

Who is Peggy Whitson?

Who is Peggy Whitson?     NASA astronaut Peggy Whitson, the only woman living onboard the International Space Station at the moment, is on track to break a big spaceflight record: at the end of April, she will have spent more cumulative hours in space than any other US astronaut. But now it looks like Whitson’s going to rack up even more flight time in lower Earth orbit than originally planned. NASA announced today that Whitson will be extending her stay on the ISS by an additional three months, adding even more hours to her record-breaking time in space. Whitson launched to the ISS in November 2016 on a Russian Soyuz rocket, along with Russian cosmonaut Oleg Novitskiy and Thomas Pesquet of the European Space Agency. Their stay on the ISS, known as Expedition 51, was meant to last until June. That’s still true for Pesquet and Novitskiy, but Whitson will now come back sometime in September. Her trip back to Earth will be with NASA astronaut Jack Fischer and cosmonaut Fyodor Yurchikhin — two crew members who are slated to launch to the ISS later this month Mostrar detalle

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bug bounty

IRS launches first civilian agency bug bounty program

IRS launches first civilian agency bug bounty program     By: Aaron Boyd, November 15, 2016 (Photo Credit: Synack) After the Department of Defense lauded the success of the Hack the Pentagon bug bounty program, it seemed only a matter of time before other departments got in on the action. While the Army announced Friday that it will be following the Pentagon’s lead, the IRS on Tuesday became the first civilian agency to launch a bug bounty program. Partnering with bounty facilitator Synack — who recently signed on to manage the second phase of the Pentagon’s program — the tax collection agency will allow a select group of vetted white hat hackers to test its systems for weaknesses. Mostrar detalle

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Digital Security

WHAT IS RANSOMWARE?

WHAT IS RANSOMWARE?     Ransomware is a type of malware that infects computer systems, restricting users’ access to the infected systems. Ransomware variants have been observed for several years and often attempt to extort money from victims by displaying an on-screen alert. Typically, these alerts state that the user’s systems have been locked or that the user’s files have been encrypted. Users are told that unless a ransom is paid, access will not be restored. The ransom demanded from individuals varies greatly but is frequently $200–$400 dollars and must be paid in virtual currency, such as Bitcoin. Ransomware is often spread through phishing emails that contain malicious attachments or through drive-by downloading. Drive-by downloading occurs when a user unknowingly visits an infected website and then malware is downloaded and installed without the user’s knowledge. Crypto ransomware, a malware variant that encrypts files, is spread through similar methods and has also been spread through social media, such as Web-based instant messaging applications. Additionally, newer methods of ransomware infection have been observed. For example, vulnerable Web servers have been exploited as an entry point to gain access into an organization’s network. Mostrar detalle

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Twitter future

The Near future of twitter according to Jack Dorsey. A Bloomberg interview

The Near future of twitter according to Jack Dorsey. A Bloomberg interview     Last year, amid a cratering stock price, slowing user growth, and a spate of executive departures, Twitter Inc.'s board decided to put co-founder Jack Dorsey in as chief executive. Ten months later, all the same problems remain. But Dorsey has a clearer message about what he wants to change and how he wants to change it. As investors speculate about who will buy Twitter and when, Dorsey has allowed himself to think years down the road. In a wide-ranging interview with Bloomberg Businessweek, he hints at that future. Will Twitter, currently tasked with showing you what's happening right now, be able to predict for you what's going to happen next? Is it the killer app for augmented reality? Dorsey says Twitter's role in the world still centers around bringing people together to watch live events in the place where information comes the fastest. A decade after Twitter's founding, he has faith in the crowd and its ability to bring forth a range of opinions—balancing Donald Trump's inaccuracies, for instance—but he also talks about the importance of making Twitter a safer place to speak without fear of being attacked or harassed. What follows is a lightly edited transcript of the conversation. Mostrar detalle

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