Read the excerpt from president dwight d. eisenhower's citation in jonas salk's honor, and answer the question that follows. citation from president dwight d. eisenhower to jonas salk immediate release: april 22,1955 james c. hagerty, press secretary to the president the white house following are the citations given today by the president to dr. jonas e. salk and the national foundation for infantile paralysis the citation for dr. salk is as follows: because of a signal and historic contribution to human welfare by dr. jonas e. salk in his development of a vaccine to prevent paralytic poliomyelitis, i, dwight d. eisenhower, president of the united states, present to him this citation for his extraordinary achievement. the work of dr. salk is in the highest tradition of selfless and dedicated medical research. he has provided a means for the control of a dread disease. by scientists in other countries with technical information; by offering to them the strains of seed virus and professional aid so that the production of vaccine can be started by them everywhere; by welcoming them to his laboratory that they may gain a fuller knowledge, dr. salk is a benefactor of mankind. his achievement, a credit to our entire scientific community, does honor to all the people of the united states. answer the following question based on the president dwight d. eisenhower's citation: president eisenhower refers to jonas salk's work as an "historic contribution to human welfare" and an "extraordinary achievement." president eisenhower also calls dr. salk a "benefactor of mankind." what do these words and phrases express about the president's beliefs?