It can be hard to find treasure in the junkyard known as the Internet, so I will catalogue the ones I've encountered here:
Debunking Skeptics - Probably my favorite site on the Internet (except my own, of course ^_^). I was reading it religiously as a teenager, and it provided strong support towards my questioning of mainstream theories and their devout defenders; without that site, there would likely be no Dig Deeper. If you liked my Mozilla or Coronavirus reports, you will feel right at home on Debunking Skeptics. Covers many fringe topics, such as conspiracies, extrasensory perception, and life after death. Mostly famous for its total destruction of the so-called rational skeptics, pretty much making them look like total idiots. Sadly hasn't been updated in a long time, but all the reports in there are still very relevant today.
Ciphers by Ritter - Best cryptography resource out there, by a mile. Explains the basics thoroughly and in a way that's easy to understand. Debunks myths and covers stuff that other sites don't dare to touch. Clearly, the author has a deep understanding of the topic.
Raymond Peat's site - Writings of biologist Ray Peat, mostly covering human physiology and nutrition, but drifting into other related topics (including relevant conspiracies) sometimes. Extremely well thought-out and researched; compared to regular nutrition sites, it's in another stratosphere.
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