A gravitational-wave observatory is a scientific facility designed to detect and measure gravitational waves, which are ripples in spacetime caused by the acceleration of massive objects, such as merging black holes or neutron stars. These waves were first predicted by Albert Einstein in 1916 as part of his general theory of relativity, but they weren't observed directly until 2015. Gravitational-wave observatories typically use highly sensitive instruments to measure incredibly small changes in distance caused by passing gravitational waves.
"Gray goo" is a hypothetical scenario often discussed in the context of nanotechnology and artificial intelligence. It refers to a potential future disaster in which self-replicating nanobots consume all available matter on Earth while replicating themselves, leading to a catastrophic environment filled with a homogenous, gray mass of nanomachines. The concept was popularized by nanotechnology pioneer Eric Drexler in his 1986 book "Engines of Creation.
A great circle is the largest circle that can be drawn on a sphere, representing the shortest path between two points on that sphere. In geographical terms, great circles are significant in navigation and aviation as they provide the shortest route between locations on Earth. Mathematically, a great circle is defined as the intersection of the sphere with a plane that passes through the center of the sphere. Some well-known examples include the Equator and the lines of longitude (meridians) on the Earth's surface.
Gregory Gabadadze is a physicist known for his work in theoretical physics, particularly in areas related to cosmology, general relativity, and the study of dark energy and modified gravity theories. His research often involves exploring the fundamental aspects of gravity and the universe, including the dynamics of extra dimensions and the implications of these theories for our understanding of cosmic phenomena.
Kazuhiko Aomoto is a Japanese musician, composer, and producer, known for his work in the realms of electronic and contemporary music.
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!
Intro to OurBigBook
. Source. We have two killer features:
- 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-calculusArticles 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/derivativeVideo 2. OurBigBook Web topics demo. Source. - 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.
- to OurBigBook.com to get awesome multi-user features like topics and likes
- as HTML files to a static website, which you can host yourself for free on many external providers like GitHub Pages, and remain in full control
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. 
- Infinitely deep tables of contents:
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