Awright, for the rest of us, how about explaining the historical error with the Big D puzzle.
Time and Date of the event was: 12:30 p.m. Central Standard Time (18:30 UTC) on Friday, November 22, 1963, so 51 years is correct (as of Nov. 22, 2014). Not sure why Sierra thought his "50 years" was a "historical" error, unless he just thought/remembered the date as 1964.
