r/HistoryWhatIf

For asking casual questions about historical events prior to 01/01/2001. Also see r/History or r/AskHistorians.

Badhistory is your one-stop shop for casual dissertations on the historicity of everything from bestselling books to zero-budget adult films!

r/history is a place for discussions about history. Feel free to submit interesting articles, tell us about this cool book you just read, or start a discussion about who everyone's favorite figure of minor French nobility is! This is a somewhat more serious subreddit compared to many others. Make sure to familiarize yourself with our rules and guidelines before participating. All posts must be manually approved by a moderator. Thanks!

The original alternate history subreddit

Here you can ask any question you have about being a scientist, what's new in a field, what's going to happen in a field, or are curious about how we got to this point.

Reference questions answered here. Get the answers you are looking for! Please make sure to look over the community rules before posting.

A place for all things interesting — facts, ideas, and discoveries that spark your curiosity.

The Portal for Public History. Please read the rules before participating, as we remove all comments which break the rules. Answers must be in-depth and comprehensive, or they will be removed.

Credible military history and science.

A subreddit for submission and discussion of variants of the trolley problem.

For your astronomy-related questions and content!