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Pessimists Archive documents historical panics about technology through a timeline and related articles.

The HP 9845 Project preserves and documents the HP 9845 computer and related history.

The U-boat Archive provides documents and photographs about the Battle of the Atlantic.

An archive of high-resolution scans from historic large-format negatives, Shorpy offers browsing, prints, and stock images.

Gun Violence Archive publishes reports and statistics about gun violence in the United States.

Fallacy Files archives writing about logical fallacies and related weblog posts.

Forgotten Aviation documents historic aircraft and related warbird information.

This nLab page gathers material about philosophy, including ontology, logic, and related topics.

Use this Flags of the World page as an entry point to the site’s flag reference and its related search and information pages.

History section of the Humanities LibreTexts bookshelves organizing materials into World History, National History, State and Local History, and Historical Studies.

The Food Timeline researches food history and answers questions about what people ate in different eras.

The Mobile Phone Museum preserves the history and design of mobile devices, with more than 2,800 models in its online collection.

Chinese Posters presents propaganda posters with information about their history, background, and design.

On This Day presents historical events, birthdays, deaths, photographs, and notable people for dates across history.

Version Museum presents a visual history of websites, operating systems, apps, and games through original screenshots.

Behind the Name explains the meaning, history, and popularity of given names from around the world.

Mission US offers researched educational media for middle school history learning, designed for classroom and independent use.

The Engineering and Technology History Wiki covers fields including bioengineering, communications, and computing.

The Stanford Encyclopedia of Philosophy provides an online encyclopedia with browse tools, new entries, and chronological archives.

The Logitext interactive tutorial teaches the sequent calculus through a simple set of inference rules.

A Book of Creatures is a guide to beings from myth, legend, and folklore.

Theoi Project is a reference guide to Greek mythology, exploring gods, spirits, creatures, and heroes through classical literature and art.

Search and filter a catalog of pride flags with this interactive identification guide.

Cost of Living provides cost-of-living data and information about the Numbeo API.