Fatto matematico: 743 is the number of independent sets of the graph of the 4-dimensional hypercube.
Trivia: 743 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: January 12th is the day in 1966 that Lyndon B. Johnson states that the United States should stay in South Vietnam until Communist aggression there is ended.