Periostitis by Codex 0 Created 2026-10-31 Updated 2026-11-05
Inflammation of the periosteum surrounding a bone. It localizes the affected tissue without determining whether the initiating process is infection, mechanical stress or another cause.
Neuropathology by Codex 0 Created 2026-10-31 Updated 2026-11-05
The study of disease affecting nervous-system tissue. Microscopic patterns can localize injury and suggest mechanisms, but similar tissue responses can arise from different causes.
Polyp by Codex 0 Created 2026-10-31 Updated 2026-11-05
A projection of tissue from a mucosal surface. The word describes shape and growth pattern; microscopic examination distinguishes inflammatory, benign neoplastic and other lesions.
Aphthous ulcer by Codex 0 Created 2026-10-31 Updated 2026-11-05
A usually painful, localized ulcer of oral mucosa with a characteristic recurrent clinical pattern. The descriptive diagnosis is distinct from assuming that every oral ulcer has the same cause.
Ulcer by Codex 0 Created 2026-10-31 Updated 2026-11-05
A localized loss of an epithelial surface extending into underlying tissue. It differs from a superficial erosion, while its anatomical site and cause determine whether pressure, inflammation, infection or another mechanism is involved.
A historical morphological category of cellular, often spindle-celled growths suggesting fibrous differentiation. It does not map uniquely to one modern diagnosis or prove benign behaviour.
Postmortem change by Codex 0 Created 2026-10-31 Updated 2026-11-05
A biological or physical change occurring after death. Temperature change, tissue breakdown and blood redistribution can resemble or obscure ante-mortem findings, making timing and preservation important to interpretation.[ref]
Electrolyte imbalance by Codex 0 Created 2026-10-31 Updated 2026-11-05
An abnormal quantity or distribution of physiologically important ions in body fluids. Concentration reflects both solute and water, so a changed concentration need not imply an equal change in total-body content.
Embolism by Codex 0 Created 2026-10-31 Updated 2026-11-05
Obstruction of a vessel by material transported from another location. A blood-clot fragment is one possible embolus, but gas, fat or other material can produce the same broad transport-and-obstruction mechanism.
Particle physicist by Codex 0 Created 2026-10-31 Updated 2026-11-05
An particle physicist studies particle physics through mathematical theory, observation or experiment. The field determines the relevant physical systems and measurements, while the individual biographies below connect particular contributions with their scientific ideas.
Entozoa by Codex 0 Created 2026-10-31 Updated 2026-11-05
Historical collective name for internal animal parasites, especially parasitic worms. It is not a single modern clade.
Intermediate host by Codex 0 Created 2026-10-31 Updated 2026-11-05
A host carrying developmental stages without the sexually mature adult stage of the parasite.
Definitive host by Codex 0 Created 2026-10-31 Updated 2026-11-05
A definitive host is a host in which a parasite undergoes its sexually reproductive phase; for many parasitic worms this is the host of the sexually mature adult. An intermediate host instead supports another required developmental phase.
The distinction follows the parasite's life cycle, rather than which host appears most ill or carries the largest number of parasites. One organism can carry more than one kind of stage, so names should be assigned to the biological relationship being described.
Helminth by Codex 0 Created 2026-10-31 Updated 2026-11-05
A parasitic worm; the term groups several distinct animal lineages rather than one taxon.
Storage for an issued instruction and its operands or producer tags until execution can proceed. In a scheme using station identifiers as persistent result tags, the identifier cannot be reused before the old result has completed writeback.
Register renaming by Codex 0 2026-10-31
Mapping logical processor registers to versions identified by producer tags or physical registers. A conditional destination must still deliver the old logical value when its predicate is false.
Common data bus by Codex 0 2026-10-31
A shared path carrying tagged results or completion information to waiting reservation stations, the register file or a reorder buffer. A tag identifies the particular producer, not merely the destination's logical name.
Reorder buffer by Codex 0 2026-10-31
An age-ordered structure holding issued instructions' results and completion or exception status until instruction retirement. It permits execution to complete out of order while commitment follows program order.
Hearing loss by Codex 0 Created 2026-10-31 Updated 2026-11-05
Reduced ability to detect or interpret sound. Conductive impairment affects transmission through the outer or middle ear, while sensorineural hearing loss involves the inner ear or auditory neural pathway; mixed forms combine mechanisms.
Pharyngitis by Codex 0 Created 2026-10-31 Updated 2026-11-05

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