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Horizon: Richard Feynman - No Ordinary Genius (full version)

Related:  Light and energy

The Science Channel ... Largest Sky Map Revealed: An Animated Flight Through the Universe. The first public data release from BOSS, the Baryon Oscillation Spectroscopic Survey. Led by Berkeley Lab scientists, the Sloan Digital Sky Survey's BOSS is bigger than all other spectroscopic surveys combined for measuring the universe's large-scale structure. The Third Sloan Digital Sky Survey (SDSS-III) has issued Data Release 9 (DR9), the first public release of data from the Baryon Oscillation Spectroscopic Survey (BOSS). ---Please subscribe to Science & Reason:• This animated flight through the universe was made by Miguel Aragon of Johns Hopkins University with Mark Subbarao of the Adler Planetarium and Alex Szalay of Johns Hopkins. • Music: The Cinematic Orchestra - "Arrival of the Birds"

Doppler effect Change of wavelength caused by motion of the source An animation illustrating how the Doppler effect causes a car engine or siren to sound higher in pitch when it is approaching than when it is receding. The pink circles are sound waves. When the car is moving to the left, each successive wave is emitted from a position further to the left than the previous wave. So for an observer in front (left) of the car, each wave takes slightly less time to reach him than the previous wave. The waves "bunch together", so the time between arrival of successive wavefronts is reduced, giving them a higher frequency. Doppler effect of water flow around a swan For waves that propagate in a medium, such as sound waves, the velocity of the observer and of the source are relative to the medium in which the waves are transmitted. Development[edit] General[edit] and emitted frequency is given by:[5] where is the velocity of waves in the medium; The frequency is decreased if either is moving away from the other. and

400 Free Online Courses from Top Universities Get 1,300 free online courses from the world's leading universities -- Stanford, Yale, MIT, Harvard, Berkeley, Oxford and more. You can download these audio & video courses (often from iTunes, YouTube, or university web sites) straight to your computer or mp3 player. Over 45,000 hours of free audio & video lectures, await you now. Humanities & Social Sciences Art & Art History Courses Classics Courses Ancient and Medieval Philosophy (Syllabus) - Free iTunes Video - Free Online Video - David O'Connor, Notre DameAncient Greece: City and Society - Free iTunes Audio - La Trobe University, AustraliaAncient Greece: Myth, Art & War - Free iTunes Audio - Dr Gillian Shepherd, La Trobe University - AustraliaAncient Greek History - Free Online Course - Donald Kagan, YaleAncient Israel - Free Online Course - Daniel Fleming, NYUAncient Philosophy - Free Online Audio - David Ebrey, UC BerkeleyAncient Wisdom and Modern Love (Syllabus) - Free iTunes Video - Free Online Video - David O'Connor, Notre Dame

Google's Quantum Computer Proven To Be Real Thing (Almost) | Wired Enterprise The D-Wave computer housed at the USC-Lockheed Martin Quantum Computing Center in Marina del Rey, California. Photo: Mae Ryan/Wired Google bought one. So did Lockheed Martin, one of the world’s largest defense contractors. D-Wave, the company that built the thing, calls it the world’s first quantum computer, a seminal creation that foretells the future of mathematical calculation. No doubt, the argument will continue. “[Our research] rules out one type of classical model that has been argued as a proper description of the D-Wave machine,” Lidar says. ‘Our research rules out one type of classical model that has been argued as a proper description of the D-Wave machine. — Daniel Lidar The paper, Experimental Signature of Programmable Quantum Annealing, appears in the well-respected academic journal Nature Communications. This “qubit” can store a “0″ and “1″ simultaneously. The rub is building even a single qubit is difficult. “We call it an energy landscape,” he says. Dr.

KHAAAAAAAAAAAAAAAAN (academy) « #AltDevBlogADay Its the best website you’ve never heard of. Originally I had planned to do an update on TREMBLE, my SPU loop pipeliner and optimizer. I added some cool new features like multi-implementation odd/even pipeline balancing macros and a GUI for people to play around with. However, since I am pretty tied up with SIGGRAPH presentation issues at the moment, I am going to take the easy way out and write a short article on something very near and dear to my heart. We all know some programmer that knows nothing about math. If past experiences are indicators, we know him extremely well because he is us. Enter Khan Academy. Furthermore, there is a really cool practice system in place that ties into the videos. And of course most near and dear to our hearts is the metagame. I’ll now close with a list of stuff I love about Khan academy 0) If there is ever something you’ve been curious about or wanted to learn, this is the way to go! 1) Sometimes people lose concentration in class. 2) Khan is human.

You're Interacting With Dark Matter Right Now - Megan Garber ... But scientists have no idea how. Here's a little experiment. Hold up your hand. Now put it back down. In that window of time, your hand somehow interacted with dark matter -- the mysterious stuff that comprises the vast majority of the universe. Dark matter, in other words, is not merely the stuff of black holes and deep space. But if you did the experiment -- as the audience at Hooper's talk on dark matter and other cosmic mysteries did at the Aspen Ideas Festival today -- you didn't feel those million particles. It's everywhere. And yet, despite its mysteries, we know it's out there. Dark matter, in other words, is aptly named. And it also means, Massey pointed out, that for scientists, "the job security is great." You might be wondering, though: given how little we know about dark matter, how is it that Hooper knew that a million particles of the stuff passed through your hand as you raised and lowered it? "I cheated a little," Hooper admitted.

ShowMe App Lets Anyone Create Lessons to Make Online Learning Accessible to All WHAT: Create lessons on a virtual whiteboard with a voice-over, then share them with the ShowMe community. The community votes lessons up and down, with the best lesson of the day appearing on the homepage. Available for free as an iPad app for lesson creation. Users can access lessons on the ShowMe website. LAUNCHERS: San Kim, CEO and Karen Bdoyan, CTO. WHY: Many people have knowledge but have no easy way to share their expertise. WHEN/WHERE: ShowMe app: June 2011 / New York. BACKSTORY: San was a teacher and a tutor for eight years and has “always been passionate about education.” BUSINESS MODEL: Not decided. COMPETITION: User-generated video on other platforms and the Khan Academy, an online database of more than 2,400 videos that covers topics from history to science. ON KHAN ACADEMY: “It’s awesome in the sense they’re building lots of functionality,” San says. CUSTOMERS/GROWTH: Not disclosing. PHILOSOPHY: To let anyone create lessons and share them easily with everyone.

One-way mirror A one-way mirror, one-way glass, or two-way glass is a mirror that is partially reflective and partially transparent. When one side of the mirror is brightly lit and the other is dark, it allows viewing from the darkened side but not vice versa.[1] Design[edit] The optical properties of the mirror can be tuned by changing the thickness of the reflecting layer. The glass is coated with, or has encased within, a thin and almost-transparent layer of metal (usually aluminium). The result is a mirrored surface that reflects some light and is penetrated by the rest. A true one way mirror does not, and cannot, exist.[1] Light always passes exactly equally in both directions. Use[edit] A one-way mirror is typically used as an apparently normal mirror in a brightly lit room, with a much darker room on the other side. When such mirrors are used for one-way observation, the viewing room is kept dark by a darkened curtain or a double door vestibule. Smaller versions are sometimes used in: See also[edit]