"Drawing Hands" is a famous illustration by the Dutch artist M.C. Escher, created in 1948. The artwork features two hands that appear to be drawing each other. Each hand holds a pencil and is engaged in the act of sketching the other hand, creating a paradoxical situation where the drawing seems to generate the drawers. The image plays with concepts of recursion and self-reference, challenging the viewer's perception of reality and the relationship between two-dimensional and three-dimensional space.
Dr. Kawashima's Brain Training for Nintendo Switch is a video game developed by Nintendo, part of the popular Brain Training series created by Dr. Ryuta Kawashima. Released in July 2020, the game is designed to challenge players' cognitive abilities through various brain exercises and mini-games. The game features a diverse range of activities that test memory, attention, calculation, reading, and other mental skills.
The Dubna 48K, also known as the Дубна-48К, is a vintage home computer that was developed in the early 1980s in the Soviet Union, specifically in the city of Dubna. It was aimed at educational institutions and enthusiasts, offering a variety of features that were competitive with other home computers of the time.
The Dungey Cycle, named after American motocross racer Ryan Dungey, describes a pattern of performance in motocross racing that emphasizes the importance of consistency, adaptability, and endurance. While the term might not be widely known outside of specific motocross communities, it reflects the broader principles observed in sports and competition.
Dušan Ristanović may refer to a specific individual, but as of my last update in October 2023, there is no widely recognized figure by that name in popular culture, history, or notable events.
Dynabeads are a type of magnetic bead used primarily for biochemical and molecular biology applications, such as cell isolation, protein purification, and nucleic acid extraction. Developed by Life Technologies (a part of Thermo Fisher Scientific), these beads have a uniform size and are coated with specific ligands, antibodies, or other biomolecules that allow them to selectively bind to target cells, proteins, or nucleic acids.
An Energy-Based Model (EBM) is a type of probabilistic model used in machine learning and statistics that associates a scalar energy value with each configuration (or state) of the model. The main idea is to define a system where the probability distribution of configurations is related to their energy, typically such that lower energy states are more probable.
Radionuclides used in radiometric dating are unstable isotopes that decay over time at a predictable rate, known as a half-life. This decay process allows scientists to determine the age of materials by measuring the amount of the parent radionuclide and its stable daughter products.
The Widom insertion method is a technique used in statistical mechanics and computational chemistry to calculate the chemical potential of a system, particularly in the context of molecular simulations. The method is named after B. Widom, who introduced it in the early 1970s.
Earth 300 is an initiative focused on addressing climate change and sustainability through the development and deployment of advanced technologies. Launched in 2021, the project aims to create a floating research vessel that will serve as a mobile laboratory and platform for scientific collaboration, education, and innovation. The vessel is designed to facilitate research on various aspects of climate science, ocean health, and renewable energy.
Earthquake clusters, swarms, and sequences are terms used to describe specific patterns of seismic activity that occur in close temporal and spatial proximity. Here's a brief overview of each term: 1. **Earthquake Clusters**: - These are groups of earthquakes that occur in a specific region over a relatively short time period. The earthquakes within a cluster are usually closely spaced in both time and location, but they may not have a direct causal relationship with one another.
Earthquake engineering is a field of engineering that focuses on designing and constructing buildings, bridges, dams, and other structures to withstand the seismic forces generated by earthquakes. The primary goal of earthquake engineering is to reduce the risk of structural failure and to protect lives and property during seismic events. Key aspects of earthquake engineering include: 1. **Seismic Analysis**: Engineers evaluate how structures respond to earthquakes using various mathematical models and simulations.
Eastern Macedonia and Thrace is a geographic and administrative region in northern Greece. It is situated in the northeastern part of the country, bordered by Bulgaria to the north and Turkey to the east. This region encompasses three regional units: Xanthi, Rodopi, and Drama, as well as parts of the Kavala regional unit and the city of Alexandroupolis.
Ecoauthoritarianism refers to a political system or ideology that prioritizes environmental protection and sustainability through authoritarian means. In such a system, the government imposes strict regulations and control over individuals, industries, and communities to achieve ecological goals, often justifying these actions by emphasizing the urgency of environmental crises like climate change, biodiversity loss, and pollution.
Ecological theories are frameworks used to understand the relationships between individuals and their environments, emphasizing how these interactions shape behavior, development, and social structures. These theories originate from ecology, the study of organisms and their interactions with one another and their environment, and are often applied in fields such as psychology, sociology, and education. **Key Aspects of Ecological Theories:** 1.
Econometric models are statistical models used in econometrics, a field that applies statistical methods to economic data to give empirical content to economic relationships. These models are designed to analyze and quantify economic phenomena, test hypotheses, and forecast future trends based on historical data. ### Key Components of Econometric Models: 1. **Economic Theory**: Econometric models are often grounded in economic theories that provide a framework for understanding the relationships between variables.
Ectotherms, often referred to as "cold-blooded" animals, are organisms that rely on external environmental conditions to regulate their body temperature. Unlike endotherms (warm-blooded animals), which generate their own heat through metabolic processes, ectotherms' body temperature fluctuates with the temperature of their surroundings.
TeXnicCenter is a free, open-source integrated development environment (IDE) for LaTeX, a typesetting system widely used for producing scientific and mathematical documents due to its powerful handling of formulas and bibliographies. TeXnicCenter is specifically designed to work on the Windows platform and provides a user-friendly interface that allows users to create and edit LaTeX documents easily.
The Edisonian approach refers to a method of problem-solving and innovation that is characterized by trial and error, experimentation, and incremental improvements, rather than relying solely on theoretical analysis or formal planning. Named after the prolific American inventor Thomas Edison, this approach emphasizes the importance of practical experimentation and hands-on experience in the development of new products or solutions.
The Edison Manufacturing Company was an American company founded by Thomas Edison in 1887, primarily focused on the production of electric light bulbs and other electrical equipment. Initially established as a subsidiary of Edison's broader electrical ventures, the company was integral to the development and commercialization of electric lighting technology.

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 5. . 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.
  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