13.

Social Studies-

Folklore surrounding the number 13 appears in many cultures around the world: one theory is that this is due to the cultures employing lunar-solar calendars (there are approximately 12.41 lunations per solar year, and hence 12 "true months" plus a smaller, and often portentous, thirteenth month). This can be witnessed, for example, in the "Twelve Days of Christmas" of Western European tradition.

Some people consider 13 to be an unlucky number, but there is no evidence to support this. 

Triskaidekaphobia The fear of the number 13. People with triskaidekaphobia try to avoid things numbered 13. 

Math-

In mathematics the number 13 is a “happy number,” which is a number which eventually reaches 1, when replaced by the sum of the square of each digit. For instance, 13 is a happy number because 1 squared plus 3 squared equals 10; and 1 squared plus 0 squared equals 1.

Whether Superstition or Rationality, in I.School 13 is 1 (you) plus 3 (to build).

  1. What have you learned?

  2. (what are you talking about?)

  3. What are you building? (What is your motivation?)

Day by day.