some wikipedia articles i've read and love. (◬ = content warning!)

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• 0 ‍ ‍ ➚
• alexander supertramp ‍ ‍ ➚ ◬
• april fools' day ‍ ‍ ➚
• beale ciphers ‍ ‍ ➚
• boredom ‍ ‍ ➚
• cluedo ‍ ‍ ➚
• cottingley fairies ‍ ‍ ➚
• dalai lama ‍ ‍ ➚
• dennis nilsen, serial killer ‍ ‍ ➚ ◬
• donner party ‍ ‍ ➚ ◬
• dora/heinrich ratjen ‍ ‍ ➚ ◬
• dunkel war's ‍ ‍ ➚
• equivocation ‍ ‍ ➚
• elizabeth báthory (the 'bloody countess') ‍ ‍ ➚ ◬
• fritzl case ‍ ‍ ➚ ◬
• heart symbol ‍ ‍ ➚
• hindenburg disaster ‍ ‍ ➚ ◬
• indigenous peoples of the americas ‍ ‍ ➚
• jack the ripper ‍ ‍ ➚ ◬
• klabautermann ‍ ‍ ➚
• moiré pattern ‍ ‍ ➚
• physiognomy ‍ ‍ ➚
• placebo ‍ ‍ ➚ ‍ ‍ ; ‍ ‍ self-fulfilling prophecy ‍ ‍ ➚
• sailing ship ‍ ‍ ➚ ♡
• secondary education in the united states ‍ ‍ ➚
• sleeper hit ‍ ‍ ➚
• stockholm syndrome ‍ ‍ ➚ ◬
• trench coat ‍ ‍ ➚
• uncontacted peoples ‍ ‍ ➚

‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ lists:

• cognitive biases ‍ ‍ ➚
• common english usage misconceptions ‍ ‍ ➚
• common false etymologies of english words ‍ ‍ ➚
• countries whose capital is not their largest city ‍ ‍ ➚
• english monarchs ‍ ‍ ➚ ‍ ‍ ; ‍ ‍ british monarchs ‍ ‍ ➚
• eponymous laws ‍ ‍ ➚
• list of paradoxes ‍ ‍ ➚
• most-liked tweets ‍ ‍ ➚
• pseudosciences ‍ ‍ ➚ ‍ ‍ (e.g. crop circles ‍ ‍ ➚ ‍ ‍ ; ‍ ‍ dowsing ‍ ‍ ➚)
• rhetorical terms ‍ ‍ ➚
• serial killers by number of victims ‍ ‍ ➚ ◬
• terminology within polyamory ‍ ‍ ➚
• unusual deaths ‍ ‍ ➚ ◬

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German:

• Ortsname ‍ ‍ ➚
• Pechtropfenexperiment ‍ ‍ ➚
• Schwarzer Peter ‍ ‍ ➚

‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ lists:

• Deutsche Redewendungen ‍ ‍ ➚
  • Verballhornung ‍ ‍ ➚
• Rhetorische Stilmittel ‍ ‍ ➚

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also check out ilya's list and love's list for more.