general_fact: 138 is the Saros number of the solar eclipse series which began on June 6, 1472 and will end on July 11, 2716.
math_fact: 138 is the smallest product of 3 primes, such that in base 10, the third prime is a concatenation of the other two.
trivia: 138 is keith Deller's score in the 1983 BDO World Darts Championship trophy against Eric Bristow, amongst the most memorable in darting history.
historical_date: May 17th is the day in 1875 that Aristides wins the first Kentucky Derby.