Slender is a psychiatrist. He has the duty to face his patients every day. Most of them are killers and psychopaths. Jeff the killer, a cannibal with blue mask, someone afraid of water, or the patients who have issues in their minds.
PHD Comics: Gravitational Waves Explained Simple explanation but really interesting for further understanding on gravitational waves. "That's one small step for man, one giant leap for mankind" Neil Armstrong quote Mehr