Fatto matematico: 2308 is the number of conjugacy classes of the alternating group A_{29}.
Trivia: 2308 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: April 26th is the day in 1981 that Dr. Michael R. Harrison of the University of California, San Francisco Medical Center performs the world's first human open fetal surgery.