Ask HN: Higher order derivatives in everyday life?
"In the fall of 1972 President Nixon announced that the rate of increase
of inflation was decreasing. This was the first time a sitting president
used the third derivative to advance his case for reelection."<p>-- <a href="http://www.ams.org/notices/199610/page2.pdf" rel="nofollow">http://www.ams.org/notices/199610/page2.pdf</a>