Seasonal adjustment is a statistical technique used to remove the effects of seasonal variations in time series data. Many economic and financial indicators, such as employment rates, retail sales, and production figures, often exhibit regular patterns that recur in a predictable manner at specific times of the year, such as holidays or harvest seasons. These seasonal variations can distort the underlying trends in the data. By applying seasonal adjustment, analysts aim to produce a clearer view of the underlying trends by isolating and removing these predictable seasonal influences.
"Revisited" is a compilation album by American satirical songwriter Tom Lehrer, released in 1960. The album features a selection of Lehrer’s well-known songs, showcasing his unique blend of wit, humor, and musical talent. It includes tracks that cover various subjects, often highlighting social and political themes of the time with a humorous and satirical edge. The album has become a classic in Lehrer's discography and is representative of his style, characterized by clever lyrics and catchy melodies.
Parker Brothers is an American toy and game company established in 1883 by George S. Parker, Charles Parker, and Edward Parker. It became widely known for producing classic board games, including "Monopoly," "Clue" (known as "Cluedo" in some regions), "Risk," and "Sorry!" Over the years, Parker Brothers has contributed significantly to the gaming industry, creating games that have become beloved household staples.
As of my last knowledge update in October 2023, Tonka refers to a brand known primarily for its toys, particularly dump trucks and construction vehicles. It is not widely recognized for producing television series.
A **planar graph** is a graph that can be drawn on a plane without any edges crossing each other. In other words, it's possible to lay out the graph in such a way that no two edges intersect except at their endpoints (the vertices). Key characteristics of planar graphs include: 1. **Planar Representation**: If a graph is planar, it can be represented in two dimensions such that its edges only intersect at their vertices.
A **cycle double cover** of a graph is a particular type of subgraph that consists of a collection of cycles in which each edge of the original graph is included in exactly two of these cycles. More formally, for a given graph \( G \), a cycle double cover is a set of cycles such that every edge in \( G \) is covered exactly twice by the cycles in the set.
"Dessin d'enfant" is a French term that translates to "children's drawing." In the context of art, it often refers to the style and characteristics of drawings made by children. These drawings are typically marked by their simplicity, spontaneity, and unique perspective. They reflect a child's imagination, interpretation of the world, and emotional expression without the constraints that often accompany adult artistic conventions.
A Graph-encoded map is a representation of spatial information using graph theory concepts. In this context, a graph consists of nodes (or vertices) and edges (or connections) that connect these nodes. Graph-encoded maps are often used in various fields, such as computer science, transportation, geography, and robotics, to model and analyze complex relationships and pathways in spatial environments.
Password manager by Ciro Santilli 37 Updated 2025-07-16
A cross browser, cross platform, and server-encrypted password manager is a must after Snowden!!! E.g. Proton Pass. And governments should obviously provide one to its citizens, or else be spied upon by the USA obviously: Governments should provide basic Internet infrastructure.
Kerckhoffs's principle by Ciro Santilli 37 Updated 2025-07-16
Basically the opposite of security through obscurity, though slightly more focused on cryptography.

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