Fatto generale: 1596 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 1596 is the sum of the first 15 Fibonacci numbers.
Trivia: 1596 is an unremarkable number.
Data storica: May 14th is the day in 1804 that the Lewis and Clark Expedition departs from Camp Dubois and begins its historic journey by traveling up the Missouri River.