An individual who feels the need to check and recheck repeatedly whether or not the stove was turned off is probably suffering from an obsessive-compulsive disorder (OCD).
An OCD is a mental disorder that affects people with an obsession to check things repeatedly without any reason in particular. In the example provided, the individual cannot control the need to check if the stove is turned off.
Other types of OCD include doing certain routine activities repeatedly such as washing hands several times during the day.
People affected by OCD usually look for help with different therapies in order to overcome this mental disorder.
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The transactions of a bus going 20 miles per hour due to quantum physics.
Where is the question? :)
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Intelligence can somehow be determined by genes but your personality cannot be decided by genetic factors. We can say that Enviromental factors affect your temparament or your personality more than your genes.
Social contract. They came together and set an expectation on how they will conduct themselves.
