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Quantum mechanics 101: Demystifying tough physics in 4 easy lessons

Quantum mechanics 101: Demystifying tough physics in 4 easy lessons
Ready to level up your working knowledge of quantum mechanics? Check out these four TED-Ed Lessons written by Chad Orzel, Associate Professor in the Department of Physics and Astronomy at Union College and author of How to Teach Quantum Physics to Your Dog. 1. Particles and waves: The central mystery of quantum mechanics One of the most amazing facts in physics is that everything in the universe, from light to electrons to atoms, behaves like both a particle and a wave at the same time. But how did physicists arrive at this mind-boggling conclusion? 2. Austrian physicist Erwin Schrödinger, one of the founders of quantum mechanics, posed this famous question: If you put a cat in a sealed box with a device that has a 50% chance of killing the cat in the next hour, what will be the state of the cat when that time is up? 3. When you think about Einstein and physics, E=mc^2 is probably the first thing that comes to mind. 4. Related:  ciencia

World's Biggest Data Breaches & Hacks Skip to content New! Learn to do data-viz with our online seminars. Book now! World’s Biggest Data Breaches & Hacks Loading Share this: Facebook 7,592 Twitter 11,308 Reddit 243 LinkedIn Pinterest Sign up for more! World’s Biggest data breaches and hacks. Let us know if we missed any big data breaches. Created with data-visualisation software VizSweet. » See the data: bit.ly/bigdatabreaches » Safely check if your details have been compromised in any recent data breaches: Learn to Create Impactful Infographics » Sign up to be notified when we release new graphics» Check out our beautiful books» Learn to create visualizations like this: Workshops are Beautiful Sources: IdTheftCentre, DataBreaches.net, news reports Credits: Design & concept: David McCandless Code: Tom Evans Tech: VizSweet Balloon Race Research: Miriam Quick, Ella Hollowood, Christian Miles, Dan Hampson, Duncan Geere Data: View the data Topics: Tech & Digital More Snake Oil Cannabis? Is yours here?

index Australopithecus deyiremeda is the name of the new fossil hominid species discovered in the site of Woranso-Mille —in the central region of Afar, in Ethiopia. The discovery, described in the international scientific journal Nature, takes to another level the on-going debate on early hominid origin and evolution in Africa. The scientific team lead by Professor Haile-Selassie has found several fossil remains (upper and lower jaws and a collection of teeth) in the sites of Burtele and Wayteleyta, in Woranso-Mille, in the central region of Afar, about 50 kilometres north of Hadar and 520 kilometres northeast of the capital Addis Ababa. Experts have assigned these 3.3 – 3.5 million-year-old fossil specimens to the new species Australopithecus deyiremeda. Lucy was not the only australopithecus in the Afar region Map of Ethiopia showing the Afar Region. Scientists have long argued that A. afarensis was the only pre-human species which lived in the region between 3 and 4 million years ago.

Every Black Hole Contains a New Universe | Inside Science Inside Science Minds presents an ongoing series of guest columnists and personal perspectives presented by scientists, engineers, mathematicians, and others in the science community showcasing some of the most interesting ideas in science today. (ISM) -- Our universe may exist inside a black hole. This may sound strange, but it could actually be the best explanation of how the universe began, and what we observe today. It's a theory that has been explored over the past few decades by a small group of physicists including myself. Successful as it is, there are notable unsolved questions with the standard big bang theory, which suggests that the universe began as a seemingly impossible "singularity," an infinitely small point containing an infinitely high concentration of matter, expanding in size to what we observe today. But these theories leave major questions unresolved. The first is general relativity, the modern theory of gravity.

L’avenir de la programmation : le langage naturel Il existe deux types de programmation du langage naturel ; celle qui est effectuée par les grosses compagnies comme IBM et Apple, sur laquelle on ne possède bien souvent que quelques indications, et celle élaborée par les milliers de créateurs, souvent amateurs, de « chatbots » (programmes conversationnels). Celle-ci peut susciter l’intérêt du non-programmeur désireux de s’initier à cette discipline, car les outils sont disponibles et les procédés bien balisés. Les connaissances structurées : une tâche complexe et couteuse en ressources Comment fonctionnent les « gros » programmes de reconnaissance du langage naturel ? En gros, on peut travailler selon deux stratégies distinctes. A première vue l’approche structurée semble plus sûre parce qu’elle évite par trop les ambiguïtés liées au langage et ne met pas trop de pression sur le programme informatique. Un gros programme de reconnaissance du langage comme Watson, l’ordinateur champion de Jeopardy, utilise en fait la première approche.

La inmunoterapia contra el cáncer de piel que tiene un éxito nunca antes visto - BBC Mundo WolframAlpha : Une nouvelle sorte de science pour une nouvelle sorte de moteur de recherche Par Rémi Sussan le 03/06/09 | 6 commentaires | 6,463 lectures | Impression Aujourd’hui, vous avez sans doute déjà visité et utilisé WolframAlpha, et, selon vos préférences, vous l’avez trouvé plutôt extraordinaire, ou (surtout si vous êtes peu porté sur les chiffres), globalement décevant. Difficile pour l’instant de juger l’engin, qui n’en est, nous affirme-t-on, qu’à ses débuts (un truc à noter pour les collégiens et lycéens : il donne la solution des équations et trace les courbes de fonctions !). Car pour son créateur, le physicien Stephen Wolfram, également créateur du fameux logiciel Mathematica, pas de doute. Image : Stephen Wolfram, le créateur de Wolfram Alpha par Hybernaut. L’informatique est le socle de la structure du monde Qu’affirmait NKS (comme on a affectueusement surnommé ce livre) ? Autrement dit, le postulat en cours depuis Newton selon lequel les mathématiques étaient le langage de choix pour comprendre l’univers était une mauvaise habitude. Tout cela est bel et bon.

History El hallazgo podría sentar las primeras pruebas sobre la existencia de 'físicas exóticas', absolutamente desconocidas para la ciencia actual. Un equipo internacional de astrónomos descubrió un 'súper-vacío' de 1.800 millones de años luz de diámetro, mientras se encontraba estudiando un área gigantesca del espacio, demasiado fría y raramente vacía. Esta región está situada relativamente cerca de nutro sistema solar, a unos 3 mil millones de años luz y, según el científico István Szapudi, a la cabeza del equipo, "se trata de la mayor estructura individual jamás identificada por la humanidad". Este 'punto frío' fue descubierto en la zona de 'súper-vacío', hace unos 10 años. El hallazgo, por entonces, asombró a la comunidad científica, dado que la aceptada teoría del Big Bang no prevé zonas frías de semejantes dimensiones. Fuente: The Guardian Imagen: NASA

A Melting Arctic And Weird Weather: The Plot Thickens Everyone loves to talk about the weather, and this winter Mother Nature has served up a feast to chew on. Few parts of the US have been spared her wrath. Severe drought and abnormally warm conditions continue in the west, with the first-ever rain-free January in San Francisco; bitter cold hangs tough over the upper Midwest and Northeast; and New England is being buried by a seemingly endless string of snowy nor’easters. Yes, droughts, cold and snowstorms have happened before, but the persistence of this pattern over North America is starting to raise eyebrows. Is climate change at work here? Wavier jet stream One thing we do know is that the polar jet stream – a fast river of wind up where jets fly that circumnavigates the northern hemisphere – has been doing some odd things in recent years. Rather than circling in a relatively straight path, the jet stream has meandered more in north-south waves. Slowing, drunken path Jet streams exist because of differences in air temperature.

Physicists observe virtually frictionless motion at the nanoscale For the first time, researchers in the US have made friction almost completely vanish between two surfaces at the nanoscale. The discovery paves the way for engineering surfaces that can slide past each other with virtually no resistance, and could hugely advance the development of nanomachines. Ordinarily, friction exists wherever two surfaces meet - whether that’s car tyres on a road or a protein flowing through a blood stream. But there’s a phenomenon known as ‘superlubricity’ where friction almost entirely disappears, and this is what scientists have now managed to recreate by carefully tuning the spacing of individual atoms on a surface. The most direct application of this research is the creation of longer-lasting nanomachines made out of single molecules, which currently are worn down by friction far more rapidly than larger objects because they have so few atoms to lose. The possibilities are pretty exciting.

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