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.
Scarlet fever is a rare bacterial infection that causes a fine, pink rash across the body. Associated symptoms of infection, such as nausea, pain and vomiting, are common. The condition is usually treated with antibiotics. Scarlet fever is not usually serious but it is contagious.