The Clue , by allowing us to imagine what we do not know, stimulates a desire for knowledge.
A Symptom is distinguished overly rigidly from a sign in that a symptom - for example, fatigue or pain - is subjective; whereas a sign - for example, fever or high blood pressure - objective, while in fact both are reports made about the body, only from the positions of patient vs. clinician.
6 concepts in this pillow book.