"Depression is known to be caused by a deficit of certain neurochemicals or neurotransmitters, especially norepinephrine ..."

"None are so desolate but something dear, Dearer than self, possesses or possess'd A thought, and claims the homage of a ..."

"A low serotonin level . . . can dry up the wellsprings of life’s happiness, withering a person’s interest in his exi..."