Interactife life calendar that helps visualize history

We tried to develop an application (completely free to use) for creating life calendars, and this is one example of its use.
For example, look at many events of the 20th century through the calendar of life: https://storycell.vercel.app/stories/44

I am not a historian, all information and dates were taken from Wikipedia.

Do you find this website useful and what functionality does it lack?