This depends on the condition of the bill. In normal used condition, they are worth exactly $2. $2 bills dated 1976 and newer are the ones worth face value only. The $3/$4 figure is reasonable for bills dating back to the 1950s.
Klein thought he had, discovered the poison to be due to a disease of the cow. An epidemic of scarlet fever broke out in London in December, 1885, and the outbreak could be traced to the milk supplied by a herd in Hendon.
Simple wet heat in the form of hot water, which is inexpensive and available to everyone, was the first systematic contraceptive heat method discovered by the scientific community. In 1946 Dr. M. Voegeli , after more than ten years of experimentation with nine male volunteers, reported on this method.