Fatto matematico: 19981 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 19981 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: September 14th is the day in 1958 that the first two German post-war rockets, designed by the German engineer Ernst Mohr, reach the upper atmosphere.