Supposing you are one of the people who do not really believe in aliens I am guessing you have worked out that humans are the dominant life form on this planet. As a matter of fact our mind has developed a number of feelings that no other animal can possess.
- Actually speaking is found nowhere else. Although parrots can mimic speech, they do not actually understand what they are saying. The only animal capable of communication through speech is humans.
- Only humans are capable of laughing. Freud famously said that “There is no such thing as a joke”. As a matter of fact laughter only exists as a form of social acceptance.
- Mental illness is a human trait. Currently 1% of the world population is suffering from schizophrenia and 1 in 4 people you will meet will suffer from a major depressive episode at least once in their lives.
- Crying. Although other animals cry from fear (see: crocodiel tears) only humans can shed emotional tears.