image MIT 18.06 Linear Algebra Spring 2005 Course Highlights This course features a complete set of video lectures by Professor Gilbert Strang. There are also Java applets with sound as well as interactive Java applets. The text for this class is Introduction to Linear Algebra by Gilbert Strang. Course Description This is a basic subject on matrix theory and linear algebra. Course Homepage 18.06 Linear Algebra Spring 2005 Course features at MIT OpenCourseWare page: Complete MIT OCW video collection at MIT OpenCourseWare - VideoLectures.NET Top 22 Animals You've Never Heard Of | MadPet - Funny Pets Videos and Pictures Mother nature is beautiful and hosts us thousand of beautiful species and breathtaking nature and environment we live in. All around the world there are a lot of untested areas and a lot of species that are not discovered. In today’s article we will show you top 22 animals that are discovered, but rare and not so well known. The Dhole The Dhole is a species of canid native to South and Southeast Asia. The Babirusa Babirusa, meaning “Hog-deer”, are members of the pig family found in Wallacea, or specifically the Indonesian islands of Sulawesi, Togian, Sula and Buru. Pink Fairy Armadillo The pink fairy armadillo is approximately 3.5-4.5 inches long, excluding the tail, and is pale rose or pink in color. The Fossa The fossa is a cat-like, carnivorous mammal that is endemic to Madagascar. The Gerenuk The gerenuk, also known as the Waller’s gazelle, is a long-necked species of antelope found in dry thorn bush scrub and desert in Eastern Africa. Naked Mole Rat Irrawaddy Dolphin Markhor Yeti Crab
Spike sorting - Scholarpedia Figure 1: Extracellular recordings are usually done by inserting microwires in the brain. The signal from the microwire is amplified and band-pass filtered and the firing of the nearby neurons appears as spikes on top of background activity. Spikes are detected using an amplitude threshold and then sorted according to their shapes. For neurons close to the electrode tip -about 50 to 100 microns (Gerstein and Clark, 1964; Buzsaki, 2004)- the signal-to-noise ratio is good enough to distinguish the activity of each single unit (inner circle). For more distant neurons (outer circle) -up to about 150 microns- spikes can be detected but the difference in their shapes is masked by the noise (multi-unit activity). Spike sorting is the grouping of spikes into clusters based on the similarity of their shapes. Single cell recordings Spike sorting –i.e. the classification of which spike corresponds to which neuron- is a very challenging problem. Basic spike sorting methods Spike sorting step by step
These 19 Nightmarish Places Will Keep You Awake At Night… They Sent Chills Down My Spine. As you go about your daily life, it’s easy to forget all of the weird and wonderful things that are tucked away around the world. A Redditor cobbled together 19 of the strangest places on earth, reminding us all of the creepy things that could be hidden in our very towns. Dark forests, abandoned cities, strange museums and other oddities are everywhere. You just need to know how to find them. 1.) 2.) 3.) 4.) 5.) 6.) 7.) 8.) 9.) 10.) 11.) 12.) 13.) 14.) 15.) 16.) 17.) 18.) 19.) Some of the strangest places on earth aren’t legitimately haunted, instead they are haunted by the memories of the horrors that were once committed there. Share these strange places with others… spread the chills that go down your spine.
Sound Analysis Pro — Animal Behavior Sound Analysis Pro has it's own site now: SoundAnalysisPro.com Click here to download Sound Analysis Pro (it's free) Click here to see publications that used SAP Sound Analysis Pro2011 is a software & hardware system designed specifically to manage the acquisition and analysis of animal vocalization. Feature summary of SAP2011: SAP2011 can be installed in any Windows computer (XP to Windows 7). 1. 2. 3. 4. 5. 6. 7. 8. About Sound Analysis Pro Sound Analysis Pro2011 is an integrated system for studying animal vocalization. SAP2011 is an extension of Sound Analysis 3, although little remains from previous versions. The heart of SAP2011 is a digital signal processing (DSP) engine called ztBirdEngine, developed for us by David Swigger (ZettaTronics Inc). On top of this foundation, we designed several higher-level engines. Ofer Tchernichovski
How To Fathom Pi: Amazing Visual Illustrations Distribution of the first 123,201 digits of π mapped onto a red-yellow-blue Brewer palette and placed as circles on an Archimedean spiral by Martin Krzywinski Pi is, quite possibly, the most famous number known to man.* This fact is a little bit ironic, as we don’t actually have a number for pi. Well, not a complete number anyways, because pi never ends. If you try to pin it down to the decimal, you can’t do it—the decimal representation goes on endlessly, and it never settles into a repeating patters. Hence, all the fame. If you are unfamiliar with this number, pi is the mathematical constant that represents the ratio of a circle’s circumference to its diameter, and it is typically written as 3.14159 . However, (despite some minor set backs) the quest to understand pi continues. Recently, Cristian Ilies Vasile created an amazing way to visualize pi. This visual representation was created by a 41 year old individual who suffered brain damage after being attacked by muggers.
A4 Papercuts Ogni scultura cartacea realizzata dall’artista Peter Callesen ha un unico punto di partenza: un candido e standardizzato foglio formato A4. Quello che accade dopo il “trattamento Callesen” lo potete vedere con i vostri occhi. Uccelli in procinto di spiccare il volo, scheletri che prendono vita… “The negative and absent 2 dimensional space left by the cut, points out the contrast to the 3 dimensional reality it creates, even though the figures still stick to their origin without the possibility of escaping“. Chapeau. [Via] Comments comments 12 Enjoyable Names for Relatively Common Things Fancy yourself a logophile ... and didn't have to look up "logophile"? See if you know these 12 words for common things. 1. 2. 3. 4. 5. 6. 7. 8. Getty Images 9. 10. 11. 12. What are some of your favorite extra ordinary/extraordinary words? For 12-12-12, we’ll be posting twenty-four '12 lists' throughout the day.
▶ One Direction - What Makes You Beautiful (5 Piano Guys, 1 piano) - ThePianoGuys We're on Tour! Sheet Music: Album here: song here: Subscribe to our main channel: to our BTS channel: us on Facebook: us on Twitter: Get PianoGuys T-Shirts, Wristbands, Sheetmusic here: STORY BEHIND THE SONGThe idea: A couple months ago the 5 of us were gathered round a piano prepping for a video shoot scheduled for that day. The song: We went through several song possibilities before landing on "What Makes You Beautiful" by One Direction. The location: Where to film? Many thanks to the awesome guys at Annex Recording and Giles Reaves (engineer) for letting us record at their studio.
5 Ancient New Year’s Celebrations — HISTORY Lists There’s nothing new about New Year’s. Festivals marking the beginning of the calendar have existed for millennia, and a few are still actively observed by millions of people around the world. Get the facts on the ways 5 ancient civilizations rang in the New Year.These early New Year’s celebrations often had important social, political and religious implications, but in some cultures the holiday traditions were not so different from the champagne, parties and fireworks of today. 1. Getty Images Following the first new moon after the vernal equinox in late March, the Babylonians of ancient Mesopotamia would honor the rebirth of the natural world with a multi-day festival called Akitu. One fascinating aspect of the Akitu involved a kind of ritual humiliation endured by the Babylonian king. 2. Roman coins depicting Janus Romans would celebrate January 1 by giving offerings to Janus in the hope of gaining good fortune for the new year. 3. 4. 5.
Body Painter Transforms Humans Into Breathtaking Portraits Of Animals There’s more to this beautiful heron than meets the eye. It’s actually a human body covered intricately in paint. The stunning work was created by artist Shannon Holt, a body painter from Florida who’s known for her ability to transform the human body into a canvas for beautiful art. The piece is part of Holt’s “Florida Wildlife Series,” a collection of several animal portraits, all painstakingly drawn on human bodies. In a May interview with the Daytona Beach News-Journal, Holt explained what it is about body painting as a medium that she loves so much. “You can have a really beautiful work that transforms the body into a human sculpture or abstract piece that touches on art history, or is a master copy of an Italian Renaissance painting,” she told the news outlet. She added that she loves the “ephemeral” nature of body painting. Scroll down to see more images of Holt’s "Florida Wildlife Series." Ryder Gledhill / Shannon Holt / Caters News Honey Bees
Astrophysicist Writes Brutal Response To WSJ Article Claiming Science Has Proven God Exists Recently – Christmas Day, in fact – the Wall Street Journal published an article by a Christian apologist who boldly declared that science was “increasingly” making the case for God, year-after-year. Eric Metaxas is best known as a biographical writer, but he is also lauded (in conservative circles) for his work promoting the pro-life movement and making sweeping, outrageous conclusions about the existence of God based on whatever tenuous evidence seems handy at the time. If sweeping, outrageous conclusions be Metaxas bread-and-butter, than his Wall Street Journal article is perhaps his magnum opus. It’s a doozy. After subtitling his work “The odds of life existing on another planet grow ever longer. The arguments aren’t new. Today there are more than 200 known parameters necessary for a planet to support life—every single one of which must be perfectly met, or the whole thing falls apart. Feature image via The Conversation
Insane Assassin's Creed III concept art by William Wu.