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The original was posted on /r/todayilearned by /u/orangeflyingmonkey_ on 2025-02-06 21:19:11+00:00.
Original Title: TIL that a curb in Hayward, CA, sat on the Hayward Fault and slowly split apart by 4mm per year. Geologists used it to track tectonic movement for decades—until the city unknowingly destroyed it in 2016.
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