Fatto matematico: 1900 is the largest palindrome in Roman numerals.
Trivia: 1900 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: March 14th is the day in 1942 that Orvan Hess and John Bumstead became the first in the world to successfully treat a patient, Anne Miller, using penicillin.