can anyone give me tips on how to write an essay on jonas salk's work on polio my professor said that i needed 2-4 subtopics.
The first step is always to gather information. Since this is not my area of expertise, I searched Google under the key words "Jonas Salk polio" to get these possible sources:
http://www.pbs.org/wgbh/aso/databank/entries/dm52sa.html
http://www.achievement.org/autodoc/page/sal0bio-1
http://www.time.com/time/time100/scientist/profile/salk.html
http://www.accessexcellence.org/AE/AEC/CC/polio.html
http://en.wikipedia.org/wiki/Jonas_Salk
Subtopics can include personal biography, education, what brought him into the particular field, how he went about researching the vaccine, history of polio, criticisms of his work or other topics.
I hope this helps. Thanks for asking.