Technetium (99mTc) mertiatide is a radiopharmaceutical used primarily in medical imaging, particularly in the field of nuclear medicine. It is a technetium-based compound that is utilized for its ability to target and visualize certain tissues or organs within the body.
Thermochromic ink is a type of specialized ink that changes color in response to temperature changes. This property is due to the incorporation of thermochromic pigments or dyes within the ink formulation. These pigments are sensitive to temperature variations and can exhibit a reversible color change, meaning they can switch from one color to another when heated or cooled.
Dragon boat by Ciro Santilli 40 Updated 2025-07-16
Things to do:
Video 1.
Dragon Boat Festival race day in Hong Kong by South China Morning Post (2018)
Source.
Scholar-official by Ciro Santilli 40 Updated 2025-07-16
The "Chinese scholar" is one of the traditional male ideals of Chinese culture.
Particular attributes the ideal Chinese scholar would have include:
It is in a sense sad (or awesome) that the computer has essentially replaced, or one may argue, enhanced beyong recognition, all of the traditional four arts, to the point that Ciro can't touch anything that is not a computer. Sometimes the old arts live on particularly closely though, e.g. in computer music, computer graphics and computer Go.
Baijiu by Ciro Santilli 40 Updated 2025-07-16
Figure 1.
A traditionally shaped baijiu ceramic bottle
. Source.
Pu Songling by Ciro Santilli 40 Updated 2025-07-16
Sometimes you just know that your existence will be remembered for a singular reason. Better than not being remembered at all perhaps.
Appears to be a small section from the Diamond Sutra. TODO find or create a video of it, it is just too awesome.
Video 1.
A Hundred Birds Pay Homage to the Phoenix with suona solo performed by Li Guangcai
. Source.
Caesium-137 by Ciro Santilli 40 Updated 2025-07-16
Highly radioactive isotope of caesium with half-life of 30.17 y. Produced from the nuclear fission of uranium, TODO exact reaction, not found in nature.
The fucked thing about this byproduct is that it is in the same chemical family as sodium, and therefore forms a salt that looks like regular table salt, and dissolves in water and therefore easily enters your body and sticks to things.
Another problem is that its half-life is long enough that it doesn't lose radioactivity very quickly compared to the life of a human person, although it is short enough to make it highly toxic, making it a terrible pollutant when released.
This is why for example in the goiânia accident a girl ended up ingesting Caesium-137 after eating an egg after touching the Caesium with her hands.
The Torelli theorem is a fundamental result in algebraic geometry and the theory of Riemann surfaces, attributed to the mathematician Carlo Alberto Torelli. It essentially describes the relationship between the algebraic structure of a curve and its deformation in terms of its Jacobian.
The Groma is an ancient surveying instrument used primarily by the Romans and other cultures for land division and construction. It is designed to measure right angles and to lay out straight lines over distance. The Groma consists of a vertical staff (or pole) with a horizontal crossbar that is usually equipped with plumb lines hanging from each end.
Transient noise refers to brief, sudden bursts of sound that can occur in various contexts, often characterized by quick changes in amplitude and frequency. These sounds can arise from a variety of sources, including: 1. **Electrical Impulses**: In electronic systems, transient noise can be caused by sudden changes in voltage or current, often due to switching actions, circuit disruptions, or electrical arcing.
Transport infrastructure refers to the physical structures, facilities, systems, and services that enable the movement of people and goods from one location to another. This infrastructure can vary significantly based on geographic, economic, and social conditions of a location. Here are some examples of transportation infrastructure categorized by location: ### Urban Areas - **Roads and Highways**: Multi-lane roads, expressways, and urban streets designed for vehicles, along with sidewalks and bike lanes for pedestrians and cyclists.

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