Jonas Salk was the first American physician and medical researcher who created the first effective and safe vaccine for Polio. Creating this effective vaccine makes Jonas Salk very Knowledgeable because he was very engaged with issues, in this case the Polio disease. This is important because the Polio disease is an deadly contagious disease. And around this time this disease was out of control because there was no way to cure it. This shows he is Knowledgeable because this disease had a major global significance because this disease was worldwide, therefore he solved a worldwide issue.
