5 Reasons We May Live in a Multiverse The universe we live in may not be the only one out there. In fact, our universe could be just one of an infinite number of universes making up a "multiverse." Though the concept may stretch credulity, there's good physics behind it. And there's not just one way to get to a multiverse — numerous physics theories independently point to such a conclusion. Here are the five most plausible scientific theories suggesting we live in a multiverse: 1. Scientists can't be sure what the shape of space-time is, but most likely, it's flat (as opposed to spherical or even donut-shape) and stretches out infinitely. So if you look far enough, you would encounter another version of you — in fact, infinite versions of you. View gallery Space-time may stretch out to infinity. 2. In addition to the multiple universes created by infinitely extending space-time, other universes could arise from a theory called "eternal inflation." 3. 4. 5.
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Koops | Blog Geek & High Tech 5 Psychological Experiments That Prove Humanity is Doomed Cracked.com's new book is now on sale. What follows is one of 22 classic articles that appear in the book, along with 18 new articles that you can't read anywhere else. Psychologists know you have to be careful when you go poking around the human mind because you're never sure what you'll find there. A number of psychological experiments over the years have yielded terrifying conclusions about the subjects. Oh, we're not talking about the occasional psychopath who turns up. The Asch Conformity Experiment (1953) The Setup: Solomon Asch wanted to run a series of studies that would document the power of conformity, for the purpose of depressing everyone who would ever read the results. Subjects were told that they would be taking part in a vision test, along with a handful of people. The Result: Questions the subjects were asked were like the puzzle shown here: All they had to do was say which line on the right matched the one on the left. ... and make sure you conform to it perfectly. C.
Quantum gas goes below absolute zero PHOTOCREO Michal Bednarek/Thinkstock Temperature in a gas can reach below absolute zero thanks to a quirk of quantum physics. It may sound less likely than hell freezing over, but physicists have created an atomic gas with a sub-absolute-zero temperature for the first time1. Their technique opens the door to generating negative-Kelvin materials and new quantum devices, and it could even help to solve a cosmological mystery. Lord Kelvin defined the absolute temperature scale in the mid-1800s in such a way that nothing could be colder than absolute zero. However, by the 1950s, physicists working with more exotic systems began to realise that this isn't always true: Technically, you read off the temperature of a system from a graph that plots the probabilities of its particles being found with certain energies. Schneider and his colleagues reached such sub-absolute-zero temperatures with an ultracold quantum gas made up of potassium atoms.
Tutoriel WordPress : 65 tutoriels WordPress gratuits Des tutoriels WordPress ? En quelques années, WordPress.org s’est imposé comme l’un des logiciels libres de référence pour procéder à l’installation et à la gestion d’un blog au quotidien. En parallèle, la plateforme gratuite de création et d’hébergement de blogs WordPress.com connaît un grand succès. Pour les EPN (espaces publics numériques), le grand public, les associations, les commerçants, les artisans, les TPE et les PME et les personnes ayant un projet de blog, WordPress.com est d’une grande souplesse. Voici une sélection de 65 tutoriels gratuits WordPress (WordPress.com et WordPress.org) à télécharger. 65 tutoriels WordPress gratuits à télécharger Manuels et guides « Créer son blog WordPress et y publier ses premiers articles » par l’Ecole du Blog (19 pages, en pdf) « Créer un site sous WordPress » par Speed Avance (17 pages, en pdf) « Guide pour gérer son blog sur une plateforme utilisant WordPress.org » par Enseignons.be (27 pages, en pdf) Prise en main Projets Utilisation avancée
How Mathematics Can Make Smart People Dumb - Ben O'Neill Mathematics can sometimes make smart people dumb. Let me explain what I mean by this. I don't mean that it is dumb not to be good at mathematics. After all, mathematics is a highly abstract and challenging discipline requiring many years (decades even) of study, and there are plenty of very smart people who have little understanding of it, and little ability to use it. What I mean is that mathematics quite often bamboozles people into accepting very silly arguments — arguments that are so silly that if you stated them without draping them in mathematical negligee, you would instantly become an object of ridicule to all those people who flunked out at basic algebra back in high school. The danger of mathematical arguments is that a person can sometimes follow an absurd path of reasoning without being alerted to its absurdity, due to the fact that their mind is so lost in the verbiage of mathematical equations that their common sense fails to penetrate it. But wait a minute. Notes
Tesla: Master of Lightning "In almost every step of progress in electrical engineering, as well as radio, we can trace the spark of thought back to Nikola Tesla" - Ernst F. W. Alexanderson Tesla with one of his famous "wireless" lamps. Few inventors contributed more to advances in science and engineering in the early 20th century than Nikola Tesla. As fate would have it, Tesla, one of the world's greatest inventors, died penniless and in obscurity. Today, there's quite a bit of resurgence in Tesla's popularity, which is helped in part by his mystique as a "mad scientist." Tesla Company letterhead. In their book, Tesla: Master of Lightning , authors Margaret Cheney and Robert Uth tell the story of the enigmatic genius from his birth in a little village in what is Croatia today, to his lonely death in a New York hotel room. On a personal note, it has taken me far longer than I expected to write this excerpt for Neatorama Spotlight. to anyone interested in learning more about the legendary Nikola Tesla.