Here are some one liners...
Back to the Future: The Gregorian Calendar -- The modern calendar is introduced but it is not accepted universally. I talk about various problems people had with the calendar and also talk about the time drift experienced by the scientists handling the Mars Rover.
The Douay Catholic Bible Translation -- Every translation is an interpretation so the Catholics come out with their own interpretation of the Bible in English.
'The Ambition of Oda Nobuna' is Not Just a TV Show -- The Japanese leader is caught without a defense so he sets fire to the temple and kills himself. I also talk about the TV show and video game that includes his character as a reference.
Back to the Future: The Gregorian CalendarPope Gregory the 13th introduces the Gregorian calendar. It replaces the Julian calendar which has been drifting from its connection to the traditional names of the months. (Example: December means the 10th month, but it's not the 10th month.) The Julian calendar adds an extra day every 4 years but its too much of a correction, adding a little over 11 minutes to every year. This is interfering with the calculation of the religious holidays, particularly Easter, so the Pope commissioned the mathematician Christoph Clau to come up with a solution. He uses leap years, but with special rules...       
- Every year that is exactly divisible by four is a leap year, except for years that are exactly divisible by 100, but these centurial years are leap years if they are exactly divisible by 400.