does anyone know cool facts about the number 15?

Question

its for a school project due tomarrow

Answer 1

In parts of Latin America, a girl's fifteenth birthday is regarded very important - the occasion for a special celebration.

http://en.wikipedia.org/wiki/Quincea%C3%B1era

Fifteen is a triangular number and a hexagonal number, a pentatope number, and the 4th Bell number.

http://en.wikipedia.org/wiki/15_%28number%29

Answer 2

51 backwards 14 more than 1 :P half of 30 3, 5 times 5, 3 times interstate 15 is the fourth longest north-south transcontinental interstate highway in the U.S. (Wikipedia) there are 15 letters in the word uncopyrightable lol thats all i can think of

Answer 3

15 is 1.25 dozen
15 is 75% of 20