the salk poliomyelitis vaccine was tested on ~1 million children in 1954. in early 1955 the data came in that the vaccine was efficacious and safe

Why was the treaty of versailles harsh on germany?

Which battle was one of the most devastating for

Which of the following world and national events led to a new view of people with disabilities in the us:     a.  world war i and ii veterans with disabilities returned home after the wars.b.  john f. kennedy was elected president and had a sister with a disability.c.  the civil rights and feminist movements.d.  all of the above.