NUMBER 13

1. Where can you see number 13 ?

1.1. in education

1.2. rarely in public place

2. Unlucky aspect of 13

2.1. history of why 13 became unlucky

2.2. some events relating to unlucky 13

3. Lucky aspect of 13

3.1. the reality of 13

3.2. Is 13 unlucky or normal ?