Dogs, birds, fish, there is something between animals that can let them have a mutual understanding
Philosophy
The shortest yet the most complicated and hardest question for a human is to ask themselves: (Who Am I)
Politics
Myself, my house, my family
Psychology
Touching the strings of the soul and strings of the hear and the strings of the mind is much more beautiful than the tunes of the strings of a musical instruments
Reading
Offfff... History with all derivatives, geography, nature, Soviet literature, Arabic literature, Chinese wisdom
Religion
Since biology is specialized in brain, we need to get interested in the narcotics of the soul and mind!