- How many hours is enough for a person to get a good night's sleep?
- What does the smiley grin mean when communicating,does it mean a joke that the other person joked ? Or does he like the girl?
- Why do people not forget the alphabet, counting rules, foreign languages, etc. during amnesia ?
- What extremely generalizing concepts exist?
- Is there a hint of anxiety in the apparent serenity of Debussy's Nocturne?