The term "Jewish Ukrainian mathematicians" refers to mathematicians of Jewish heritage who were born in or worked in Ukraine, or who have connections to Ukrainian academic and cultural life. Historically, Ukraine has had a significant Jewish population, especially before the Holocaust, and many Jewish individuals have made notable contributions to mathematics, science, and related fields.
Ultrasound-switchable fluorescence imaging is an advanced imaging technique that combines ultrasonography and fluorescence microscopy to enhance imaging capabilities in various biological and medical applications. This method exploits the unique properties of ultrasound waves to modulate or switch on/off fluorescence signals from specific markers or probes within tissues. ### Key Concepts: 1. **Fluorescence Imaging**: This involves the use of fluorescent dyes or proteins that emit light upon excitation.
A "Blue Hole" is a marine geological phenomenon characterized by a large, underwater sinkhole or vertical cave that has a deep blue color due to its considerable depth. These formations are typically found in tropical and subtropical regions and are often associated with coral reef formations. The depth and clarity of the water in blue holes create striking visual contrasts, making them popular among divers and tourists. One of the most famous blue holes is the Great Blue Hole in Belize, which is part of the Belize Barrier Reef.
Bidirectional text refers to text that contains both left-to-right (LTR) and right-to-left (RTL) writing systems within the same document or piece of content. This phenomenon is common in languages such as Arabic and Hebrew, which are written from right to left, while languages like English, French, and Spanish are written from left to right. In bidirectional text, the layout and reading order can become complex as the languages interact.
In Unified Modeling Language (UML), a **Classifier** is a fundamental concept that represents a general kind of thing in the model. Classifiers are used to define the structure and behavior of a system. They can encapsulate attributes (data) and operations (methods), and they are an essential part of object-oriented design. ### Types of Classifiers in UML 1. **Class**: The most common type of classifier.
Project Xanadu by Ciro Santilli 40 Updated 2025-07-16
Crazy overlaps with Ciro Santilli's OurBigBook Project, Wikipedia states:
Administrators of Project Xanadu have declared it superior to the World Wide Web, with the mission statement: "Today's popular software simulates paper. The World Wide Web (another imitation of paper) trivialises our original hypertext model with one-way ever-breaking links and no management of version or contents.
Video 1.
New Game in Town by TheTedNelson (2016)
Source.
Human Brain Project by Ciro Santilli 40 Updated 2025-07-16
www.nature.com/articles/d41586-023-02600-x
Almost since it began, however, the HBP has drawn criticism. The project did not achieve its goal of simulating the whole human brain — an aim that many scientists regarded as far-fetched in the first place. It changed direction several times, and its scientific output became “fragmented and mosaic-like”, says HBP member Yves Frégnac
They overreached it seems.
Light cone by Ciro Santilli 40 Updated 2025-07-16
The key insights that it gives are:
  • future and past are well defined: every reference frame sees your future in your future cone, and your past in your past cone
    Otherwise causality could be violated, and then things would go really bad, you could tell your past self to tell your past self to tell your past self to do something.
    You can only affect the outcome of events in your future cone, and you can only be affected by events in your past cone. You can't travel fast enough to affect.
    Two spacetime events with such fixed causality are called timelike-separated events.
  • every other event (to right and left, known as spacelike-separated events) can be measured to happen before or after your current spacetime event by different observers.
    But that does not violate causality, because you just can't reach those spacetime points anyways to affect them.
Figure 1.
Animation showing how space-separated events can be observed to happen in different orders by observers in different frames of reference
. Source.
Photosynthesis by Ciro Santilli 40 Updated 2025-07-16
It is quite cool that photosynthesis works just like cellular respiration by producing a proton potential through chemiosmosis.
All non-clade groups are evil. All non-clade terms must be forgotten. Some notable ones:
"Ship load" typically refers to the quantity of goods, cargo, or materials that a ship is designed to carry. It can relate to various measurements, including: 1. **Deadweight Tonnage (DWT)**: This is the maximum weight a ship can safely carry, including cargo, fuel, crew, provisions, and any other items. 2. **Cargo Capacity**: This specifically refers to the volume or weight of goods that can be loaded onto the ship for transport.

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