After world war 1 (i need 20 characters)
<span>Depression is linked to an imbalanced level in serotonin. Serotonin is a neurotransmitter that is produced in the brain. These neurotransmitters helps the brain to send and receive messages from one part of the body to another. Serotonin affects nearly all the cells within the brain. As a result human behavior, mood, sleep, and even appetite can be greatly influenced. Aggressive behavior although can result from the same imbalanced levels of serotonin. Researches believe that the lack of receptors, or the inability for serotonin to reach these receptors, may also impact our ability to control anger and aggression.</span>
Professor paragon spends at least half an hour before each class cleaning the whiteboard. even streaks from the cleaning spray create an overwhelming tension for him, and he is preoccupied by the idea that previous markings are dirty and will contaminate his notes. over the past month, his inability to stop washing the board has led to increasingly delayed class start times. professor paragon's anxious thoughts are obsessions and these repetitive behaviors are compulsions. Commonly known as OCD, it is a form of anxiety that causes people to suffer from chronic and unavoidable patterns of unwanted intrusive thoughts that can not be suppressed or ignored despite having the desire to do so.
