Learn (in)significant dates of the 20th century that will have no impact in your lives whatsoever, except maybe to impress your friends. Maybe that might impact your lives, whatever.
Gain an insight into the century long past that you might find nothing significantly different from our current century, or new millennium. History repeats itself.
By the way, its also a calendar and you can save your insignificant or significant appointments, whichever applies. ENJOY!