Wikipedia's sister sites include directories of travel guides, species, and media

Wikipedia articles are read more than 16 billion times every month

Nearly 300,000 volunteers worldwide help write, edit, and fact-check articles on the site in real-time, striving to ensure content is authored from a neutral point of view. All pages are freely accessible and must include citations to reliable, published sources.

As of 2025, the Wikimedia Foundation funds 14 open-source, free knowledge projects

Since its founding in 2003, the nonprofit has provided financial, legal, and infrastructure support to Wikipedia and its sister projects (e.g., Wikinews), primarily by managing donations, which average $11, from readers. Additional funding comes from gifts exceeding $1,000, the Wikimedia Endowment, and providing Wikipedia content for commercial use.

As of January 2026, 500 new articles are added to the English Wikipedia daily

The largest Wikipedia language edition features over 7 million articles, followed by the Cebuano edition (over 6 million) and the German edition (over 3 million). The longest article is the "2025 in women's road cycling" page, and the most edited is the list of personnel from World Wrestling Entertainment.

Explore Wikipedia, but TikTok-style

Wikipedia's vast trove of information can be a bit dull to navigate. This homemade website takes real Wikipedia pages and places them in a swipeable format similar to TikTok, so you can learn about very random things in a similar mode as the culture-shifting TikTok app. Check it out here.

The Wiki Game: get to one Wikipedia topic to another as fast as you can

Wikipedia, the free, community-built encyclopedia, uses hyperlinks so users can explore topics within topics. This tool often leads readers to go down endless rabbit holes, from one topic to another, endlessly. Now, you can make a game of it by...

Wikipedia arose from a failed, for-profit online encyclopedia

Nupedia was launched in 2000 by internet entrepreneur Jimmy Wales and internet project developer Lawrence Sanger, only publishing articles written by experts after a cumbersome seven-step review process. The two developed Wikipedia to allow the public to write articles for future review, but shifting to self-moderation contributed to Sanger's departure in 2002.

Find connections between Wikipedia articles utilizing a node mapping tool

Multiple Wikipedia articles can be placed on the map, each with its own node, and expanded to reveal related articles. The goal is to expand as many subsequent nodes as needed to connect articles and identify related concepts. Any node can be double-clicked on to open its respective Wikipedia page.

Wikipedia allows users to vote for what the last article on the site will be

Labeled as "humorous" on the site, the "Last topic pool" page lists various conditions where Wikipedia's final article would be written, including various end-of-the-world scenarios, instances where humanity might cease to exist, cases of Wikipedia becoming corrupted or uneditable, and the possibility of all possible knowledge having been written about.

Explore a comprehensive encyclopedia of all known bird species and families

The "Birds of the World" collaborative ornithological platform combines millions of bird observation records with extensive information on more than 11,000 bird species, including their appearance, sounds, taxonomy, habitat, movements and migration, diet, breeding, behavior, and evolutionary histories.

A collaborative map lets anyone rename the entire world in real time

Rename.world is a playful, community-driven project where users discover, claim, and rename locations across a live global map. It's kind of like Wikipedia meets Google Maps, filtered through the internet's love of chaos and whimsy.

An encyclopedia of anthropology

This online database offers articles and additional resources for all things anthropology. This free resource is filled with peer-reviewed entries that cover topics ranging from addiction to writing, and offers anthropological insight into more...

An overview of the World Wide Web, which is often confused with the internet

When users create a website, they organize content and store it on a web server—one of various types of hardware that make up the internet—in web languages, such as HTML and JavaScript. When visiting the site, a web browser translates these languages into text and other media for consumption.

Explore the world of fan fiction

This guide to the genre's major platforms breaks down their strengths and weaknesses, offering an excellent primer for the uninitiated newcomers.

Search set lists from more than 10 million live concerts, added and edited by fans

Taking cues from Wikipedia, this Setlist wiki allows fans and concertgoers to share which songs were actually played at live concerts, across genres. The database makes this niche information about what performers choose to play year-round available for the curious.

A massive list of wildly specific museums

The definition of a museum varies depending on who you ask and where you find yourself. Need proof? Check out this list of over 80 museums—dedicated to niche interests like hand fans, hovercrafts, and celebrity leftovers (really).

Virtually all public libraries in the US offer free internet access

Beyond providing internet access, libraries have also expanded into broad digital hubs for communities. Ninety percent offer basic digital literacy training, 76% help patrons navigate online government services, and 73% assist people with job applications.

A database of grape varieties

All wines are defined in part by the type of grapes used, whether a single grape or a blend. This encyclopedic archive of grape varieties and their respective attributes is an easy way to become acquainted with just about any wine grape out there—from Albariño to Zweigelt. It also includes brief introductions to non-wine alcoholic beverage categories like beer and hard seltzer.

Swords from around the world: an encyclopedia

Swords may have fallen out of favor as the go-to method of warfare, but they once were a common choice worldwide. Scroll through this online encyclopedia to learn about and see swords from ancient to modern times. The ubiquity of swords and their...

A global list of every space exploration mission

Learn how and why we explore our solar system and beyond with space exploration missions, and find out how you can get involved.

A free archive of firsthand historical documents from explorers of America

Maintained by the Wisconsin Historical Society, the American Journeys collection contains more than 18,000 pages of primary source documents—journals, letters, maps, and accounts written between roughly 1000 CE and the early 1800s. These include eyewitness records of the Norse arrival in North America, Spanish conquistador expeditions, and the Lewis and Clark journey. Browse this list of highlights where pages from the original texts are specified (clicking a link opens a PDF).

A gallery of medical illustrations from NIH

The National Institutes of Health provides educational materials for broad use. The institute hosts a Flickr account with many different image galleries, including this one (with over 70 images to date) that illustrate and annotate curious phenomena, from the life cycles of a malaria parasite to the comparison of male and female bladders. Explore the gallery here.

The Human Genome Project spawned numerous spinoff genetics projects

The Human Genome Project led to the development of techniques later applied to projects in microbial and plant biology, epigenomics, environmental and cancer genomes, and more. In the spirit of the HGP, data from these projects has been made freely available to develop new technologies.

HRW explores women’s rights around the world

Human Rights Watch’s page documents human rights violations around the world affecting women and girls. The international women’s rights movement has made great strides over many years, but women and girls around the world continue to face...

Each scientific study adds incremental knowledge to existing understanding

On its own, no study serves as a source of truth or solves an existing problem indefinitely, though many can be analyzed collectively in a systematic review to build more confidence—the result of more data—in a conclusion. Studies can explore knowledge gaps or test an existing theory, which is always subject to refinement and improvement.

Wildlife use Rome's sprawling archaeological sites as urban havens

The Italian capital features some of the world's most famous monuments as the inheritor of ancient Rome's grandeur. This photo essay explores the city's vibrant collection of wildlife, including long-concealed native crabs, peregrine falcons, and the beaver-like nutria.

Explore the history, structure, and species of Australia's Great Barrier Reef with this interactive journey narrated by Sir David Attenborough.

Some Pokémon have been named after real and fictional organisms, while some real-world species have been named after Pokémon, such as Chilicola charizard and Binburrum zapdos.

Stanford built a Google Maps for the Roman Empire, revealing how much it cost to travel in the ancient world

Watch how viruses like Ebola can spill over from animals to humans—and vice-versa.

Explore an interactive map of battles from the American Revolution, along with detailed summaries of each engagement

When you complete a CAPTCHA on a website to prove you are human, you may be unknowingly training algorithms for self-driving cars, whose systems require training data to help identify crosswalks, bicycles, and other outdoor objects.

Browse a detailed visual analysis of over 200,000 similes—comparisons that often use 'like' or 'as'—from popular fiction to see how frequently writers the same idiomatic expressions.

The use of fungi to detoxify land and water—a process known as mycoremediation—has been used to clean up natural resources affected by the 2025 California wildfires.

Memecoins are a type of cryptocurrency—a form of digital currency with a wide variety of uses—created around popular 'memes,' or viral internet jokes.

Children are now three times more likely to say they want to be a YouTuber when they grow up than an astronaut, with some even attending 'YouTube camps' that teach kids how to create content for the platform.

Explore the known asteroids, comets, and spacecraft involved in asteroid studies within our solar system with 'Eyes on Asteroids,' a 3D visualization from NASA.

Most of the observable universe's volume consists of voids and supervoids—enormous regions of space with little to no galaxies, stars, or light.

Explore a list of the 100 best novels of all time, compiled by some of the world's best living writers, including Salman Rushdie, Stephen King, and Jennifer Egan.

Art theft is the third-largest source of criminal revenues worldwide, thanks in part to the subjective nature of valuing a work of art.

How Amazon operates a 'flywheel' business model, a self-reinforcing cycle that drives continuous growth

See the 25 of the best photos of auroras from around the world.

As of 2025, the most cited papers in science include a review of graphene, methods to improve image recognition, streamlining electron density calculations, and optimizing protein studies.

The Brothers Grimm were lawyers before they were storytellers, and became interested in fairy tales as they began investigating how rules and customs had been passed down through cultures.

Search a massive database of over 4 decades of clues from the TV quiz show 'Jeopardy!'

See photos of Meteora, a mountainous site in central Greece, home to 14th-century monasteries perched atop soaring outcroppings.

See how Budweiser's famous Clydesdales spend their days at Warm Springs Ranch, where roughly 70 to 80 of the beer brand's giant horses can be found at any given time.

Bone marrow (soft tissue found inside certain bones) generates roughly 500 billion new blood cells each day

Learn how to read a prospectus, the juicy document that any company must file with the SEC before going public.

Legendary architect Frank Lloyd Wright designed the SC Johnson headquarters in Wisconsin, aiming to make a cathedral-like workplace

Poison ivy can cause rashes year-round since all parts of the plant contain urushiol, the oil that triggers our allergic response.