Model engineering is a hobby and craft that involves the design, construction, and operation of small-scale models of machinery, vehicles, and structures. This can include various types of models, such as: 1. **Steam Engines**: Many model engineers create working miniature steam engines that can operate under steam pressure. 2. **Locomotives**: A popular area within model engineering is building live steam locomotives. Some enthusiasts even construct entire miniature railways.
Queensland is known for various "Big Things," which are large roadside attractions that celebrate local culture, history, and industry. Some of the most notable Big Things in Queensland include: 1. **Big Pineapple** (Woombye) - A large pineapple structure that represents the region's pineapple farming industry. It also features a small zoo and tropical fruit plantations.
Scale model scales refer to the ratio of the model's size compared to the actual size of the object it represents. These scales are used in various fields, such as architecture, engineering, transportation, and hobbies (like model building), to create miniatures that accurately reflect the proportions of larger structures or vehicles. Here's how scale works: 1. **Scale Ratio**: A common way to express a scale is with a ratio (e.g.
Moroccan astronomers have a rich history that dates back to medieval times when they made significant contributions to the field of astronomy, particularly during the Islamic Golden Age. One of the most notable figures was the astronomer Ibn al-Zarqali, also known as Azarques, who lived in the 11th century and is known for his work on astrolabes and for improving astronomical tables that were later used in Europe.
In group theory, a **lattice of subgroups** refers to the structure that can be formed by the collection of subgroups of a given group, ordered by the inclusion relation. Specifically, it involves the following key concepts: 1. **Subgroups**: A subgroup is a subset of a group that is also a group under the same operation.
Karen Parshall is a mathematician known for her work in the fields of history of mathematics, algebra, and mathematical biology. She has made significant contributions to the understanding of mathematics through historical perspectives and is involved in educational initiatives to promote mathematics.

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