@jk Instruments at the Steel Pier in Atlantic City detected a change in sea level over the 20th Century that, on further study, turned out not to be real. What was actually happening was that the crowds gathered on the pier to watch the diving horses were pushing it down into the sandy bottom, causing the instruments to register a change in sea level. Horse diving was suspended between 1945 and 1953, resulting in an apparent sea level change in the opposite direction for those years.

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