Project Euler

FRACT | An Indie Adventure Game by Phosfiend Systems The world can be powered by alternative energy, using today's technology, in 20-40 years, says Stanford researcher Mark Z. Jacobson | Stanford News Release January 26, 2011 A new study – co-authored by Stanford researcher Mark Z. Jacobson and UC-Davis researcher Mark A. By Louis Bergeron If someone told you there was a way you could save 2.5 million to 3 million lives a year and simultaneously halt global warming, reduce air and water pollution and develop secure, reliable energy sources – nearly all with existing technology and at costs comparable with what we spend on energy today – why wouldn't you do it? According to a new study coauthored by Stanford researcher Mark Z. "Based on our findings, there are no technological or economic barriers to converting the entire world to clean, renewable energy sources," said Jacobson, a professor of civil and environmental engineering. He and Mark Delucchi, of the University of California-Davis, have written a two-part paper in Energy Policy in which they assess the costs, technology and material requirements of converting the planet, using a plan they developed.

Bayes' Theorem An Intuitive Explanation of Bayes' Theorem Bayes' Theorem for the curious and bewildered; an excruciatingly gentle introduction. Your friends and colleagues are talking about something called "Bayes' Theorem" or "Bayes' Rule", or something called Bayesian reasoning. It's this equation. So you came here. Why does a mathematical concept generate this strange enthusiasm in its students? Soon you will know. While there are a few existing online explanations of Bayes' Theorem, my experience with trying to introduce people to Bayesian reasoning is that the existing online explanations are too abstract. Or so they claim. And let's begin. Here's a story problem about a situation that doctors often encounter: 1% of women at age forty who participate in routine screening have breast cancer. 80% of women with breast cancer will get positive mammographies. 9.6% of women without breast cancer will also get positive mammographies. What do you think the answer is? Group 1: 100 women with breast cancer.

Metcalfe's law Two telephones can make only one connection, five can make 10 connections, and twelve can make 66 connections. Metcalfe's law states that the value of a telecommunications network is proportional to the square of the number of connected users of the system (n2). First formulated in this form by George Gilder in 1993,[1] and attributed to Robert Metcalfe in regard to Ethernet, Metcalfe's law was originally presented, circa 1980, not in terms of users, but rather of "compatible communicating devices" (for example, fax machines, telephones, etc.)[2] Only more recently with the launch of the Internet did this law carry over to users and networks as its original intent was to describe Ethernet purchases and connections.[3] The law is also very much related to economics and business management, especially with competitive companies looking to merge with one another. Network effects[edit] Limitations[edit] Business practicalities[edit] Modified models[edit] See also[edit] References[edit]

Accueil 7 easy Screen-Sharing and Remote-Access Tools (All Free) Advertisement Do you want to share your Windows screen with a friend or colleague so they can troubleshoot technical issues? Perhaps you want to access your Windows desktop from your tablet to watch a movie in bed? It’s easier than ever to get remote access to your machine, with many free tools available. Stay on Your Couch! 3 Free Apps to Remote Control Your Windows PC Stay on Your Couch! Let me introduce you to seven of the best. 1. TeamViewer is perhaps the most well-known of all the third-party tools available. It doesn’t just specialize in screen-sharing and remote-access. By default, you need to enter a PIN code to connect to someone else’s machine. Unlike some of its competitors, the software also allows group sessions. Best for: All-around screen-sharing and remote-access. 2. Chrome Remote Desktop has one glaring drawback – both computers need to have the Chrome browser installed. Best for: Quickly troubleshooting Granny’s laptop. 3. Best for: Using in a small office environment.

What Loyalty? High-End Customers are First to Flee Businesses that offer their customers the highest levels of service might like to believe that all their efforts to pamper and please will pay off with an extremely loyal following. “Customers you might expect to be the most ’stuck' are the ones who are disproportionately vulnerable to service competition.” But as new research from Harvard Business School demonstrates, the customers you think are your best and most loyal are likely to be the first to cast you aside when a challenger to your service superiority barges into the market. "Our results suggest that this is due to increasing expectations for service in these markets—the longer a firm has held a service advantage in a local market, the more sensitive are its customers to it service levels relative to those of competitors," says Harvard Business School's Dennis Campbell. In other words, you reap what you sow. In How Do Incumbents Fare in the Face of Increased Service Competition? Differences across markets Consider Sheraton Hotels.

Pole of inaccessibility A pole of inaccessibility marks a location that is the most challenging to reach owing to its remoteness from geographical features that could provide access. Often it refers to the most distant point from the coastline. The term describes a geographic construct, not an actual physical phenomenon. Northern pole of inaccessibility[edit] Northern pole of inaccessibility The northern pole of inaccessibility ( WikiMiniAtlas 84°03′N 174°51′W / 84.050°N 174.850°W / 84.050; -174.850 (Northern Pole of Inaccessibility)), sometimes known as the Arctic pole of inaccessibility, or just Arctic pole, is located on the Arctic Oceanpack ice at a distance farthest from any land mass. According to some reports, the first person to reach the spot on foot was Sir Wally Herbert, who arrived by dogsled in 1968. Southern pole of inaccessibility[edit] Southern pole of inaccessibility The old Soviet Pole of Inaccessibility Station, revisited by Team N2i on 19 January 2007 Oceanic pole of inaccessibility[edit]

Why programmers work at night [This essay has been expanded into a book, you should read it, here] Image via Wikipedia A popular saying goes that Programmers are machines that turn caffeine into code. And sure enough, ask a random programmer when they do their best work and there’s a high chance they will admit to a lot of late nights. At the gist of all this is avoiding distractions. I think it boils down to three things: the maker’s schedule, the sleepy brain and bright computer screens. The maker’s schedule Paul Graham wrote about the maker’s schedule in 2009 – basically that there are two types of schedules in this world (primarily?). On the other hand you have something PG calls the maker’s schedule – a schedule for those of us who produce stuff. This is why programmers are so annoyed when you distract them. Because of this huge mental investment, we simply can’t start working until we can expect a couple of hours without being distracted. The sleepy brain But even programmers should be sleeping at night. Fin Fin

SFdS | Société Française de Statistique Sneaky VFX » Archive » Perverts September 7th, 2011 My niece had another birthday! I tried to share some more knowledge with her. Some have encouraged me to look for ways to get these published, which I will do as soon as I think of something to call them.