Template:Selected anniversaries/July 24
1786: Mathematician and explorer Joseph Nicollet born. He will map the Upper Mississippi River basin during the 1830s.
1897: Pilot and author Amelia Earhart born. She will set many records, write best-selling books about her flying experiences, and be instrumental in the formation of The Ninety-Nines, an organization for female pilots.
1901: O. Henry is released from prison in Columbus, Ohio after serving three years for embezzlement from a bank.
1909: Mathematician and cryptologist Jerzy Różycki born. Różycki will work at breaking German Enigma-machine ciphers before and during World War II.
1934: Mathematician and philosopher Hans Hahn dies. He made contributions to functional analysis, topology, set theory, the calculus of variations, real analysis, and order theory.
1974: Watergate scandal: The United States Supreme Court unanimously ruled that President Richard Nixon did not have the authority to withhold subpoenaed White House tapes and they order him to surrender the tapes to the Watergate special prosecutor.