Fatto generale: 55 is the number of Delegates who attended the United States Constitutional Convention in 1787.
Fatto matematico: 55 is a semiprime, being the product of 5 and 11 and it is the 2nd member of the (5.q) semiprime family.
Trivia: 55 is the highest speed limit allowed in the United States between 1974 and 1986 per the National Maximum Speed Law.
Data storica: February 24th is the day in 2007 that Japan launches its fourth spy satellite, stepping up its ability to monitor potential threats such as North Korea.