The Berserker hypothesis is a concept from the field of evolutionary biology and anthropology that suggests that certain aggressive and violent behaviors in humans may have evolved as adaptive responses to specific environmental pressures or social contexts. The term "berserker" originates from Norse mythology, describing fierce warriors who fought with reckless abandon, often in a trance-like state.
The San Marino Scale is a tool used in medical practice, specifically in emergency medicine, to assess the severity of abdominal pain in patients suspected of having appendicitis. It helps healthcare providers make a more informed decision regarding the need for surgical intervention based on the intensity and characteristics of the pain. The scale takes into account several factors, including the patient's pain level, physical examination findings, and other relevant clinical indicators.
The Purusha Sukta is a hymn found in the Rigveda, one of the oldest sacred texts of Hinduism. It is composed in the form of a yajna (sacrificial hymn) and is particularly notable for its philosophical and cosmological themes. The Purusha Sukta is primarily concerned with the concept of Purusha, which translates to "cosmic being" or "universal spirit." The hymn describes the creation of the universe through the sacrifice of this cosmic Purusha.
Fraunhofer diffraction refers to a type of diffraction pattern produced when light waves pass through a slit or around an obstacle and are observed at a considerable distance from the aperture or obstacle, where the incoming and outgoing waves can be treated as parallel. This condition is typically satisfied when the source of light and the observation screen are placed at infinity or sufficiently far away compared to the size of the aperture.
STED microscopy, or Stimulated Emission Depletion microscopy, is a super-resolution imaging technique used in fluorescence microscopy. It was developed to overcome the diffraction limit of conventional light microscopy, which typically restricts resolution to about 200 nanometers for visible light. The fundamental principle behind STED microscopy involves the use of two laser beams: 1. **Excitation Beam**: This laser excites fluorescent molecules (fluorophores) in the sample, causing them to emit light.
"Storm" can refer to several different concepts depending on the context. Here are a few possible interpretations: 1. **Meteorological Phenomenon**: In a weather context, a storm is a disturbance in the atmosphere characterized by strong winds, precipitation (rain, snow, sleet, hail), and sometimes thunder and lightning. Common types of storms include thunderstorms, hurricanes, tornadoes, and blizzards.
Incremental deformations refer to a concept in mechanics and material science where changes in shape or position of a material or structure occur gradually over time, rather than all at once. This approach is particularly important in analyzing and understanding the behavior of materials under various loading conditions, especially when the materials exhibit non-linear or time-dependent behavior. In incremental analysis, the total deformation is broken down into small, manageable increments.
Iron is a chemical element with the symbol Fe (from the Latin "ferrum") and atomic number 26. It is a metal in the first transition series and is one of the most abundant elements in the universe, making up about 5% of the Earth's crust. Here are some key points about iron: 1. **Physical Properties**: Iron is a dense, malleable, ductile metal that has a silvery-gray appearance.
BS 5839 Part 1 is a British Standard that provides guidelines and recommendations for the design, installation, and maintenance of fire detection and alarm systems in non-domestic buildings. Part of the broader BS 5839 series, which covers various aspects of fire safety systems, Part 1 specifically focuses on systems installed in commercial and public premises.
Critical field resistance is a term often used in the context of superconductivity and the behavior of superconductors in the presence of magnetic fields. It refers to the maximum resistance that a superconducting material can exhibit before it transitions from a superconducting state (where it exhibits zero electrical resistance) to a normal conductive state in the presence of an external magnetic field.
A music roll is a type of medium used for automatic player pianos and similar instruments to reproduce music. It consists of a long strip of paper, usually rolled up, that has perforations or holes arranged in a specific pattern. When the roll is fed into a player piano, a mechanism detects the holes and activates corresponding piano keys, allowing the instrument to play the music encoded on the roll automatically.
"Iceberg" can refer to several different concepts depending on the context: 1. **Natural Phenomenon**: An iceberg is a large piece of freshwater ice that has broken off from a glacier or shelf ice and floats in open water. Icebergs are mostly submerged, with about 90% of their mass underwater, making them dangerous for ships. They are commonly found in polar regions, especially in the North Atlantic and Antarctic waters.
A pneumatic washing system is a type of cleaning technology that utilizes compressed air to assist in the washing process. These systems are often employed in various industries for cleaning parts, equipment, or surfaces where traditional washing methods might be inefficient or impractical. ### Key Features of Pneumatic Washing Systems: 1. **Compressed Air Utilization**: The core feature of these systems is the use of compressed air to create jets or streams that dislodge dirt, debris, and contaminants from surfaces.
**Conservation and Restoration of Photographic Plates** refers to the practices aimed at preserving and restoring historical photographic plates, which are early photographic technologies such as glass negatives, daguerreotypes, and tintypes. These plates are significant artifacts due to their aesthetic and historical value and require specialized knowledge and techniques for their care. Here's an overview of what this involves: ### Conservation of Photographic Plates **1.
A sliding glass door is a type of door that consists of one or more panels of glass that slide horizontally along a track to open and close. These doors are commonly used in residential and commercial settings as an entrance to patios, decks, backyards, balconies, or even as room dividers. **Key features of sliding glass doors include:** 1.
The Pomeron is a theoretical construct in particle physics used to describe certain aspects of high-energy scattering processes, particularly in hadron collisions. It's not a physical particle in the same sense as protons or electrons, but rather a concept that helps to understand the behavior of particles when they interact at very high energies. In the context of scattering theory, a Pomeron can be thought of as a "reggeon," which is a specific type of exchanged object in a scattering process.
Free Induction Decay (FID) is a phenomenon observed in nuclear magnetic resonance (NMR) and magnetic resonance imaging (MRI). It refers to the signal that is detected after the initial excitation pulse is applied to a sample containing nuclei with magnetic properties, such as hydrogen atoms in water.
Current in the context of fluid dynamics refers to the flow of a fluid, which can be a liquid or a gas. It describes the movement of fluid in a specific direction and can be quantified in terms of velocity, which is the speed of the fluid along with its direction. Fluid currents can occur in various environments, such as: 1. **Water Currents:** These occur in rivers, oceans, and lakes, where water flows due to gravity, wind, and differences in temperature or salinity.
The term "effusive limit" usually pertains to the context of volcanic activity. It refers to the boundary or threshold at which magma begins to flow out of a volcano in a relatively non-explosive manner, resulting in an effusive eruption. These eruptions typically produce lava flows instead of explosive ash clouds, and they occur when the viscosity of the magma is low enough to allow it to flow freely.
Ledinegg instability refers to a phenomenon in thermodynamics and fluid mechanics, particularly in the context of two-phase flow systems, such as those found in nuclear reactors. It describes a stability issue that can occur in boiling systems where there is an interaction between the liquid and vapor phases. In systems that experience boiling, the rate at which vapor is generated can influence the temperature and flow characteristics.

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