Fatto generale: 78 is the atomic number of platinum.
Fatto matematico: 78 is the smallest number that can be written as the sum of of 4 distinct squares in 3 ways.
Trivia: 78 is the number of chromosomes in canine DNA.
Data storica: March 18th is the day in 1969 that the United States begins secretly bombing the Sihanouk Trail in Cambodia, used by communist forces to infiltrate South Vietnam.