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HandWiki

Wiki Encyclopedia of Knowledge
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HandWiki is a wiki encyclopedia for collaborative editing of articles on computing, science, technology and general knowledge. Registered users can post and edit articles, books, manuals and tutorials. Login or  request account using the top-right menu. We strongly encourage editors to use their real names when writing original articles. Read more here.

News

* May 10, 2026: Supported by KMF.
* May 2, 2026: Art portal.
* Nov 1, 2025: Updated. Re-register!
* Feb 10, 2024: >2M full articles
* Nov 5, 2022: Included in EncycloReader
* Apr 26, 2022: References can be imported from arXiv.org.

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Featured Article

Carl Jung

Synchronicity is a concept first introduced by psychologist Carl G. Jung to describe circumstances that appear meaningfully related yet lack a causal connection. In contemporary research, synchronicity experiences refer to one's subjective experience that coincidences between events in one's mind and the outside world may be causally unrelated to each other yet have some other unknown connection...

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Recent Pages

1. Astronomy:NGC 4752
2. Astronomy:List of minor planets: 721001–722000
3. Astronomy:Color of Neptune
4. Astronomy:NGC 6294
5. Astronomy:Medieval maximum
6. Astronomy:V454 Carinae
7. Astronomy:J094700.09+254045.8
8. Astronomy:HCG 1
9. Astronomy:546186 Vasylivchenko
10. Astronomy:NGC 2558
11. Astronomy:V361 Hydrae
12. Astronomy:209255 Myotragus

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Did You Know?

🔗 Designed World is a YouTube channel dedicated to unexplained phenomena and unusual observations. Submit your favorite remarkable cases related to unexplained, and the channel will create a visual short story. Read more and subscribe

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You can publish encyclopedic articles and blogs using a decentralized publishing platform called EnHub (enhub.org). The articles can also be saved and downloaded using the ZWI file format.

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6174 is the Kaprekar's constant, but it is often called "magic number". At first glance, the number 6174 looks like any other number, but .. Read More

Featured Learning Resources

Life: A visual story: "Mathematical Patterns: The Fibonacci Numbers and the Golden Ratio". This universe is not only finely tuned for your existence — it has astonishing math features that go far beyond what is necessary for life.

Technology: A visual story: What does it take to build a UFO? by the History Channel.

Programing: The Definitive Guide to Jython. Python for the Java Platform.

Software: DataMelt \- a free software for numeric computation, mathematics and statistics.

New books: The Designed World of Information: Unveiling the Incredible Realm Beyond (Genres: science; spirituality; religion).

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Recent Blogs

Publish With Us

Can you hold 70,000 books in one hand?
If you are reading this blog, you are a certifiable smart person and probably know about Project Gutenberg (PG)... Read more

## Mathematics and Computer Science

Here are articles on abstract concepts related to computing in a broad sense. Such topics unify foundations of mathematics with computations using computers, and can be applied to many branches of science, finance or technology. Mathematics is an essential tool in computing, but computers are used as a main tool in mathematical problem solving. These topics cover all branches of mathematics, statistics, computer science, data analysis, machine learning and information science.

##  Mathematics

Calculus, algebra, geometry, topology, logic, statistics and related topics
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##  Data Analysis

Analysis techniques, data mining, algorithms and visualization
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##  Computer concepts

Theory of calculations with computers, computer terms and programming languages
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## Natural and Formal Sciences

The portals "Natural nd Formal Sciences" are dedicated to the study of natural phenomena and physical world.

##  Astronomy

Universe, celestial objects, cosmology, space science and exploration
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##  Biology

Studies of life and living organisms
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##  Chemistry

Composition, structure and properties of matter
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##  Physics

All about physical sciences and related
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##  Earth

Sciences about the planet Earth
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##  Unsolved

Unexplained problems and unusual observations
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## Humanities

Here are the portals dedicated to the study of aspects of human society and culture. This group of topics includes arts, practices and procedures used to maintain state of physical, social and mental well-being.

##  History

Study of past events, chronological records and their interpretations
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##  Philosophy

Questions about existence, values, knowledge, reasons and mind
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##  Social

Topics related to social sciences and humanity
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##  Art

Topics related to art topics
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##  Religion

System of beliefs and wordviews that relate humanity to spirituality
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##  Medicine

Different areas of medical sciences, health and related
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##  Places

Various places, particular regions and centers of population
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## Technology, Tools and Finance

Here are articles dedicated to various technology topics (building complex devices and machines), software (computer programs and operating systems) and finance (study of money and investments).

##  Engineering

Design and manufacturing of complex devices and machines
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##  Software

Computer programs and libraries organized by topics
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##  Finance

Finance, business, market and financial calculations
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## Companies, Organizations and People

Here are articles about organizations, companies and people contributing to research and technology. They serve to support the citations in HandWiki's research articles and books.

##  Organizations

Organizations contributing to science and technology
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##  Companies

Companies contributing to science and technologies
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##  Biographies

Biographies of researches in science and technology
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## Books, Monographs, Manuals and Tutorials

Here are books, monographs and tutorials. Books and manuals are organized as collections of articles, and typically span many wiki pages. A monograph discusses a detailed study of a single specialized subject. Monographs use a single wiki page.

##  Books

Online books on science, computations and technology
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##  Monographs

Monographs on science, computations and technologies
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##  Tutorials

Tutorials on science, computations and technologies
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##  Manuals

Manuals on science, computations and technologies
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## Topical in-depth encyclopedias

Here are in-depth encyclopedias organized according the scientific fields supported in HandWiki.

##  Quantum Collection

Quantum Collection
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##  Particle Physics

Data analysis techniques in particle physics
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##  DataMelt book

Online book on DataMelt software for data science
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##  Linux Cookbook

The Linux Cookbook: Tips and Techniques
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##  Data science

Course on data science with the focus on Java
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## Help

This section contains the description of the HandWiki encyclopedia project.

* About the HandWiki encyclopedia
* Description of HandWiki formatting and editing tricks
* Copyright statements of HandWiki articles

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