Mirror sites or mirrors are replicas of other websites or any network node. The concept of mirroring applies to network services accessible through any protocol, such as HTTP or FTP. Such sites have different URLs than the original site, but host identical or near-identical content. Mirror sites are often located in a different geographic region than the original, or upstream site. The purpose of mirrors is to reduce network traffic, improve access speed, ensure availability of the original site for technical or political reasons, or provide a real-time backup of the original site. Mirror sites are particularly important in developing countries, where internet access may be slower or less reliable. The maintainers of some mirrors choose not to replicate the entire contents of the upstream server they are mirroring because of technical constraints, or selecting only a subset relevant to their purpose, such as software written in a particular programming language, runnable on a single computer platform, or written by one author. These sites are called partial mirrors or secondary mirrors. Mirror sites were heavily used on the early internet, when most users accessed through dialup and the Internet backbone had much lower bandwidth than today, making a geographically-localized mirror network a worthwhile benefit. Download archives such as Info-Mac, Tucows and CPAN maintained worldwide networks mirroring their content accessible over HTTP or anonymous FTP. Some of these networks, such as Info-Mac or Tucows are no longer active or have removed their mirrored download sections, but some like CPAN or the Debian package mirrors are still active in 2019. Debian removed FTP access to its mirrors in 2017 because of declining use and the relative stagnation of the FTP protocol, mentioning FTP servers' lack of support for techniques such as caching and load balancing that are available to HTTP. New Mirrors use HTTPS and support IPv6 along with IPv4. The primary mirror sites distribute to secondary mirrors by using rsync to ensure integrity of files and file consistency with the master mirror. (Wikipedia).
Follow Michael Stevens: https://twitter.com/tweetsauce LEARN MORE and, in order of appearence: Watch Molly dance! http://www.youtube.com/watch?v=_jljYAXLaus Javier: http://www.youtube.com/user/werevertumorro Loka: http://www.youtube.com/user/LeMondedeLoka Great web exhibit on the caus
From playlist Physics
What are Spherical Mirrors? | Reflection and Refraction | Don't Memorise
You probably know what Plane Mirrors are! But have you used Spherical Mirrors? Do you know what Spherical Mirrors are? Watch this video to know more! ✅To learn more about Physics, enroll in our full course now: https://infinitylearn.com/microcourses?utm_source=youtube&utm_medium=Soical&u
From playlist Physics
Ray Diagrams for Convex Mirrors
In this video from The Physics Classroom's video tutorial series, Mr. H demonstrates how to draw a ray diagram for objects located in front of convex mirrors. The characteristics of the image are described using the LOST Art of Image Description. You can find more information that suppor
From playlist Reflection and Mirrors
Watch more videos on http://www.brightstorm.com/science/physics SUBSCRIBE FOR All OUR VIDEOS! https://www.youtube.com/subscription_center?add_user=brightstorm2 VISIT BRIGHTSTORM.com FOR TONS OF VIDEO TUTORIALS AND OTHER FEATURES! http://www.brightstorm.com/ LET'S CONNECT! Facebook ► htt
From playlist Physics
Watch more videos on http://www.brightstorm.com/math/geometry SUBSCRIBE FOR All OUR VIDEOS! https://www.youtube.com/subscription_center?add_user=brightstorm2 VISIT BRIGHTSTORM.com FOR TONS OF VIDEO TUTORIALS AND OTHER FEATURES! http://www.brightstorm.com/ LET'S CONNECT! Facebook ► https
From playlist Geometry
Visit http://www.quirkology.com Buy the book UK: https://goo.gl/BKadJg Buy the book US: https://goo.gl/XLTErW Music: https://cameronwattmusic.wordpress.com
From playlist Amazing illusions
Concave Mirror Image Formation
In this video from The Physics Classroom's video tutorial series, Mr. H explains what an image is and how a concave mirror produces an image. Real images and virtual images are discussed and compared to each other. The characteristics of concave mirror images are described. The video titl
From playlist Reflection and Mirrors
MagLab Theory Winter School 2019: Jennifer Cano "Topo Quantum Chem"
Topic: Topological quantum chemistry: Theory The National MagLab held it's seventh Theory Winter School in Tallahassee, FL from January 7th - 11th, 2019.
From playlist 2019 Theory Winter School
MIT 3.60 | Lec 7a: Symmetry, Structure, Tensor Properties of Materials
Part 1: 2D Plane Groups, Lattices (cont.) View the complete course at: http://ocw.mit.edu/3-60F05 License: Creative Commons BY-NC-SA More information at http://ocw.mit.edu/terms More courses at http://ocw.mit.edu
From playlist MIT 3.60 Symmetry, Structure & Tensor Properties of Material
Inside the Gran Telescopio Canarias - Deep Sky Videos
The Gran Telescopio Canarias, or GTC, or GRANTECAN, is the biggest telescope at the observatory on La Palma. Video journalist Brady Haran has a look inside. With extra commentary by proper astronomer Professor Mike Merrifield, from the University of Nottingham. GTC website (English):
From playlist La Palma
A Day in the Lab: Indian Astronomical Observatory by Ramya Sethuram and Dorje Angchuk
Cosmic zoom A day in the lab: Indian Astronomical Observatory Speaker: Ramya Sethuram (Indian Astronomical Observatory) and Dorje Angchuk (Indian Astronomical Observatory) Date: 05 April 2021, 18:00 to 20:00 Venue: Online Abstract: Indian Astronomical Observatory’s 2m-Himalayan Chand
From playlist Cosmic Zoom
Lec 29 - Phys 237: Gravitational Waves with Kip Thorne
Watch the rest of the lectures on http://www.cosmolearning.com/courses/overview-of-gravitational-wave-science-400/ Redistributed with permission. This video is taken from a 2002 Caltech on-line course on "Gravitational Waves", organized and designed by Kip S. Thorne, Mihai Bondarescu and
From playlist Caltech: Gravitational Waves with Kip Thorne - CosmoLearning.com Physics
Chemistry 51A: Organic Chemistry. Lecture 16
UCI Chem 51A Organic Chemistry (Fall 2014) Lec 16. Organic Chemistry -- Stereochemistry View the complete course: http://ocw.uci.edu/courses/chem_51a_organic_chemistry.html Instructor: Susan King, Ph.D. License: Creative Commons BY-NC-SA Terms of Use: http://ocw.uci.edu/info. More course
From playlist Chem 51A: Week 6
Yuval Peres: Self-interacting walks and uniform spanning forests
Abstract: In the first half of the talk, I will survey results and open problems on transience of self-interacting martingales. In particular, I will describe joint works with S. Popov, P. Sousi, R. Eldan and F. Nazarov on the tradeoff between the ambient dimension and the number of differ
From playlist Probability and Statistics
Whispers from Space: the Detection of Gravitational Waves from a Binary Black .. by Stanley Whitcomb
Whispers from Space: the Detection of Gravitational Waves from a Binary Black Hole Merger By Prof. Stanley Whitcomb (California Institute of Technology). On 07 Apr 2016, 05:30 PM at Chandrasekhar Auditorium, ICTS, Bangalore. Description: One of the early consequences of Einstein's Gener
From playlist Public Lectures
Concave Mirror Image Characteristics
In this video from The Physics Classroom's video tutorial series, Mr. H utilizes the LOST Art of Image Description to describe the characterstics of the images formed by concave mirrors. The effect of object location upon these characteristics is emphasized. The video titled "Light Reflec
From playlist Reflection and Mirrors
Rainer Weiss explains how LIGO works: 2017 Breakthrough Prize Symposium
The 2017 Breakthrough Prize Symposium was held December 5, 2016 at UC San Francisco and co-hosted by Stanford University and UC Berkeley. The daylong event included talks and panels featuring Breakthrough Prize laureates in Fundamental Physics, Life Sciences and Mathematics, as well as oth
From playlist Astronomy & Astrophysics
In this video from The Physics Classroom's video tutorial series, Mr. H discusses how light reflects off a convex mirror and uses the "rules" of reflection to explain how an image is formed by a convex mirror. You can find more information that supports this video on our website: Lesson
From playlist Reflection and Mirrors
TMT: The World’s Most Controversial Telescope
What exactly is the Thirty Meter Telescope, and why is the proposed location in Hawai'i such a conflict? Hosted by: Hank Green SciShow has a spinoff podcast! It's called SciShow Tangents. Check it out at http://www.scishowtangents.org ---------- Support SciShow by becoming a patron on Pa
From playlist Uploads