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Coffee: jimseven, thecoffeepodcast, thecoffeetographer
Languages: duolingo, memrise, trainchinese, yellowbridge
Outdoors: hikingproject, mountainproject, 8a.nu, ukclimbing, planetmountain, snowboardaddiction
Other: xkcd, fermatslibrary, mathcounterexamples, terrytao, genealogy.math, texample, latexcolor
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