Fatto matematico: 718 is the number of unlabeled topologies with 6 elements.
Trivia: 718 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: December 18th is the day in 1999 that NASA launches into orbit the Terra platform carrying five Earth Observation instruments, including ASTER, CERES, MISR, MODIS and MOPITT.