Futility Closet
futilitycloset.com
Daily collection of puzzles, curiosities, strange historical facts, and unsolved problems — running continuously since 2005 with no algorithmic filler.
Why it is useful
Futility Closet is the antidote to algorithmic content — every entry is researched and genuinely surprising. The lateral thinking puzzles are genuinely challenging, and the historical oddities span mathematics, literature, and natural history in roughly equal measure.