1. In Greek mythology, Zeus was the thirteenth and the most powerful god.
2. Triskaidekaphobia is the fear of Friday the 13th.
3. There are approximately 13 cycles of the moon each year.
4. There are 13 cards in each suit in a standard deck of playing cards.
5. The four seasons each have 13 weeks.
6. Children become teenagers at age 13.
7. The dollar bill has many icons with 13 elements, including the pyramid, letters in E Pluribus Unum, 13 arrows and 13 stars.
8. Prohibition in the United States lasted for thirteen years, from 1920—1933.
9. 13 is a prime number and a Fibonacci number.
10. 13 flipped around is 31, which accounts for the number of days in most months.
11. The number 13 is highly represented at the Winchester Mystery House in San Jose: 13 bathrooms, 13 steps in the staircases, etc.
12. Apollo 13 had a successful landing on the moon and return to earth, despite an onboard explosion.
13. Aluminum has an atomic number of 13.

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