Fatto generale: 70 is the number of years of marriage until the platinum wedding anniversary.
Fatto matematico: 70 is the smallest weird number.
Trivia: 70 is the distance (meter) from archer to targets in Olympic Archery.
Data storica: March 10th is the day in 1876 that Alexander Graham Bell makes the first successful telephone call by saying "Mr. Watson, come here, I want to see you.