Fatto matematico: 9981 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 9981 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: April 29th is the day in 1997 that the Chemical Weapons Convention of 1993 enters into force, outlawing the production, stockpiling and use of chemical weapons by its signatories.