Fatto matematico: 2304 is the number of edges in a 9 dimensional hypercube.
Trivia: 2304 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: April 22nd is the day in 1915 that the use of poison gas in World War I escalates when chlorine gas is released as a chemical weapon in the Second Battle of Ypres.