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.
1 The  Spanish flu , 1918â1919. 2  First identified early in March 1918 in US troops training at Camp Funston, Kansas. 3  By October 1918, it had spread to become a worldwide pandemic on all continents, and eventually infected about one-third of the world's population (or â500 million persons). An H3N2 caused about 34,000 deaths in the United States. 2  This virus was first detected in Hong Kong in early 1968, and spread to the United States later that year. 3  This pandemic of 1968 and 1969 killed approximately one million people worldwide.