Cuju by Ciro Santilli 40 Updated 2025-07-16
Lit. "to kick (leather) ball".
Figures notbaly in Water Margin, where it is played by Gao Qiu. The novel also suggests that it was considered a lesser art, e.g. as opposed to the scholarly four arts and the "proper" martial arts.
Video 1.
Ancient Chinese Football Freestylers by Tifo Football (2021)
Source. Mentions that it was popular in the Ming dynasty, but then, if you will, the ball fell off a bit.
Video 2.
Bernardo cuju challenge by Manchester City (2019)
Source.
Four Gentlemen by Ciro Santilli 40 Updated 2025-07-16
Figure 1.
Plum, orchid, bamboo, chrysanthemum Chinese painting by Zheng Xie
. Source. This is an example of bird-and-flower painting, of which the Four Gentlemen are a common theme. TODO date.
Then come the most important symbols:
Num:    Value          Size Type    Bind   Vis      Ndx Name
  4: 0000000000000000     0 NOTYPE  LOCAL  DEFAULT    1 hello_world
  5: 000000000000000d     0 NOTYPE  LOCAL  DEFAULT  ABS hello_world_len
  6: 0000000000000000     0 NOTYPE  GLOBAL DEFAULT    2 _start
hello_world string is in the .data section (index 1). It's value is 0: it points to the first byte of that section.
_start is marked with GLOBAL visibility since we wrote:
global _start
in NASM. This is necessary since it must be seen as the entry point. Unlike in C, by default NASM labels are local.
Ukrainian cryptographers are individuals from Ukraine who specialize in the field of cryptography, which is the practice and study of techniques for securing communication and information. This includes the design and analysis of algorithms and protocols that protect data from unauthorized access and ensure the integrity and authenticity of messages. Ukrainian cryptographers may work in various sectors, including academia, government, and private industry, contributing to areas such as cybersecurity, blockchain technology, and secure communications.
Ari Laptev is a prominent mathematician known for his work in the fields of functional analysis, partial differential equations, and mathematical physics. He has made significant contributions to the study of elliptic boundary value problems and the theory of Sobolev spaces. Laptev's research often explores the interplay between mathematics and physics, particularly in problems related to quantum mechanics.
Diving quarries are man-made or natural quarries that have been flooded with water, creating a popular site for scuba diving and other underwater activities. These locations can offer divers a unique experience due to their submerged structures, varied underwater topography, and the potential for exploring old mining equipment or vehicles. They often provide a safe and controlled environment for training, recreational diving, and underwater exploration.
UML Partners is a term that can refer to various organizations, initiatives, or groups that focus on Unified Modeling Language (UML) in a collaborative environment. UML itself is a standardized modeling language used in software engineering to visualize the design of a system.
The A1W reactor is a type of research reactor located at the Idaho National Laboratory (INL) in the United States. It is a part of the Department of Energy's effort to facilitate research in nuclear science and technology. The A1W reactor is specifically designed for various purposes, including the testing of materials and fuel for nuclear systems, conducting experiments in neutron radiography, and supporting national security research.
Acre is a village and civil parish located in Cheshire, England. It falls within the unitary authority of Cheshire East and is situated near the larger town of Macclesfield. Historically, Acre has been known for its rural setting and traditional English countryside charm, featuring picturesque landscapes typical of the region. As of the last census, Acre's population is relatively small, contributing to its quaint village atmosphere. The area is characterized by various historical buildings, local amenities, and a sense of community among residents.
Dots per inch (DPI) is a measurement of spatial printing or video dot density, specifically the number of individual dots that can be placed in a line within the span of one inch. DPI is commonly used to describe the resolution of printers, scanners, and displays, as well as the quality of images in terms of detail and clarity. In printing, a higher DPI indicates a higher resolution, meaning that more dots are used to create an image, which generally results in better quality and sharper images.
Revolutions per minute (RPM) is a unit of rotational speed that indicates the number of complete rotations an object makes around a fixed axis in one minute. It is commonly used to measure the speed of engines, motors, and other rotating machinery. For example, if a motor is said to run at 3,000 RPM, it means that the motor completes 3,000 full rotations in one minute.
A binary code is a system of representing text or computer processor instructions using the binary number system, which uses only two symbols: typically 0 and 1. Here's a basic overview of different types of binary codes: 1. **ASCII (American Standard Code for Information Interchange)**: - A character encoding standard that represents text in computers. Each character is represented by a 7-bit binary number.
The term "hair's breadth" is an idiomatic expression used to describe a very small measurement or distance. It refers to the width of a human hair, which is typically very fine and small. In a wider context, saying something is a "hair's breadth" away implies that it is very close to a particular limit or threshold, emphasizing the narrow margin or slight difference involved. The phrase is often used in both literal and figurative language to convey precision or closeness.
Jupiter has an average radius of about 69,911 kilometers (43,441 miles). This makes it the largest planet in our solar system, significantly larger than Earth, which has a radius of about 6,371 kilometers (3,959 miles).
An inch is a unit of length in the imperial and United States customary systems of measurement. It is defined as exactly 2.54 centimeters. The inch is commonly used in various contexts, such as measuring the dimensions of physical objects, screen sizes, and in construction. One inch is divided into smaller units called fractions of an inch, with the most common divisions being halves, quarters, eighths, and sixteenths.
The term "step" can refer to different units or concepts depending on the context, but it is often associated with measuring physical activity. In fitness and health contexts, a "step" typically refers to one complete movement of a foot (or both feet) when walking or running. Commonly, pedometers and fitness trackers count the number of steps taken by an individual to monitor physical activity levels.
Pica is a unit of measurement in typography traditionally used to measure type sizes, leading (the space between lines of text), and other elements of a printed layout. One pica is equal to 1/6 of an inch or 12 points. Therefore, there are 6 picas in an inch. In practical usage, picas are often represented in design software and print layouts to help designers specify dimensions related to typography, such as margins, column widths, and line spacing.

Pinned article: Introduction to the OurBigBook Project

Welcome to the OurBigBook Project! Our goal is to create the perfect publishing platform for STEM subjects, and get university-level students to write the best free STEM tutorials ever.
Everyone is welcome to create an account and play with the site: ourbigbook.com/go/register. We belive that students themselves can write amazing tutorials, but teachers are welcome too. You can write about anything you want, it doesn't have to be STEM or even educational. Silly test content is very welcome and you won't be penalized in any way. Just keep it legal!
We have two killer features:
  1. topics: topics group articles by different users with the same title, e.g. here is the topic for the "Fundamental Theorem of Calculus" ourbigbook.com/go/topic/fundamental-theorem-of-calculus
    Articles of different users are sorted by upvote within each article page. This feature is a bit like:
    • a Wikipedia where each user can have their own version of each article
    • a Q&A website like Stack Overflow, where multiple people can give their views on a given topic, and the best ones are sorted by upvote. Except you don't need to wait for someone to ask first, and any topic goes, no matter how narrow or broad
    This feature makes it possible for readers to find better explanations of any topic created by other writers. And it allows writers to create an explanation in a place that readers might actually find it.
    Figure 1.
    Screenshot of the "Derivative" topic page
    . View it live at: ourbigbook.com/go/topic/derivative
  2. local editing: you can store all your personal knowledge base content locally in a plaintext markup format that can be edited locally and published either:
    This way you can be sure that even if OurBigBook.com were to go down one day (which we have no plans to do as it is quite cheap to host!), your content will still be perfectly readable as a static site.
    Figure 2.
    You can publish local OurBigBook lightweight markup files to either https://OurBigBook.com or as a static website
    .
    Figure 3.
    Visual Studio Code extension installation
    .
    Figure 4.
    Visual Studio Code extension tree navigation
    .
    Figure 5.
    Web editor
    . You can also edit articles on the Web editor without installing anything locally.
    Video 3.
    Edit locally and publish demo
    . Source. This shows editing OurBigBook Markup and publishing it using the Visual Studio Code extension.
    Video 4.
    OurBigBook Visual Studio Code extension editing and navigation demo
    . Source.
  3. https://raw.githubusercontent.com/ourbigbook/ourbigbook-media/master/feature/x/hilbert-space-arrow.png
  4. Infinitely deep tables of contents:
    Figure 6.
    Dynamic article tree with infinitely deep table of contents
    .
    Descendant pages can also show up as toplevel e.g.: ourbigbook.com/cirosantilli/chordate-subclade
All our software is open source and hosted at: github.com/ourbigbook/ourbigbook
Further documentation can be found at: docs.ourbigbook.com
Feel free to reach our to us for any help or suggestions: docs.ourbigbook.com/#contact