Some more comedy science from Mr. Blejer:
Gelotology s the study of humor and laughter, its effects on the human body, and of medical abnormalities of laughing. It is also the psychological and physiological study of laughter. The word is from the Greek gelos, geloto meaning laugh, laughter, laughing . Do not confuse this with the Latin element gel-, gelat-, gelati-,meaning “freeze, congeal” and “gelatin”, from which we get Jello. The two roots are entirely unrelated, NO MATTER WHAT BILL COSBY TELLS YOU.