The first new lead character on "Sesame Street" in 13 years, introduced in August 2006:

Abby Cadabby
Abby is three years old and a "fairy in training." Her catchphrase is to be "that's so magic!" She's the first designated female lead character to appear on "Sesame Street."
Source: Daily News (New York), 8/10/2006

 
   
  Original working title for Sesame Street:

"Preschool Educational Television Show"
According to the Atlanta Constitution, one writer suggested the name "Open, Sesame", which led to Sesame Street.
Source: Atlanta Journal Constitution, 4/3/2004

 
   
  Date of first episode of Sesame Street:

Nov. 10, 1969

Source: Washington Post, 4/3/1997