1. Life forms have a certain rhythm and are repeated in a certain cycle.
Biorhythm has been born because it knows human intellect, emotions, and physical condition.
The intellect has a cycle of 33 days, the emotion has a cycle of 28 days, and the body has a cycle of 23 days.
It is expressed as a sine curve and a percentage.
2. I have a notepad so that I can memorize anything.